FORM 2
THE PATENTS ACT, 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE: "A HYDRAULIC BRAKING SYSTEM, A METHOD OF OPERATING AND A
METHOD OF ASSEMBLING THEREOF"
Name and address of the Applicant:
TATA MOTORS LIMITED, an Indian company having its registered office at Bombay
House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001, Maharashtra, INDIA.
Nationality: INDIAN
The following specification particularly describes the nature of the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present disclosure relates to a braking system. More particularly it relates for energizing front wheel brakes by the braking reaction of rear brakes of a vehicle with hydraulic brakes.
BACKGROUND
In the conventional braking system, the brake pedal is connected to a tandem master cylinder through a hydraulic or vacuum assisted booster. Pedal effort is magnified through booster and given to the tandem master cylinder. The primary and secondary ports of the tandem master cylinder supply pressurized brake fluid to front and rear brakes. In any braking system, the braking reaction is absorbed by the axles or chassis of the vehicle, where the brakes are installed and the braking reaction goes as a waste. Also, the conventional braking system uses various kinds of valves for distributing the braking forces between front and rear axles. .
Hence, there exist needs to develop a brake system utilizing the brake reaction of the rear brakes for energizing front brakes thereby utilizing the braking reaction occurring at the rear brakes.
STATEMENT OF THE DISCLOSURE
Accordingly, the present disclosure relates to a hydraulic brake system for a vehicle, comprises a master cylinder coupled to a brake pedal of the vehicle for displacing a brake fluid to brakes, wherein the master cylinder generates a hydraulic braking pressure in response to a brake pedal operation, Rear brakes mounted on a rotary flange through a brake anchor plate for braking rear wheels, wherein front brakes are connected to the master cylinder through a control unit; and an auxiliary cylinder connected to each of the front brakes for transmitting hydraulic braking pressure to the front brakes, wherein the auxiliary cylinders are disposed in the vicinity of rear wheels of the vehicle, and the control unit connected to the master cylinder, wherein the control unit operates conditionally only when pressure generated by auxiliary cylinder is less than the pressure in the master cylinder, also relates to a method of operating a hydraulic brake system of a vehicle, the method comprises acts of generating hydraulic braking pressure of the fluid by applying pressure onto the brake pedal, wherein the generated hydraulic braking pressure supplies pressurized fluid to activates the rear brakes to activate the rotary flange, wherein the activation of the rotary flange activates the auxiliary cylinders to supply brake fluid to cylinders of the front brake, activating braking action of the rear brakes by restricting rotation of the rotary

flange when cylinders of the front brakes are filled up completely with hydraulic brake fluid and also relates to a method of assembling a hydraulic brake system, the method comprises acts of coupling the master cylinder to the brake pedal of the vehicle for displacing the hydraulic braking fluid to brakes, wherein the master cylinder generates the hydraulic pressure in response to brake pedal operation; connecting the control unit to the master cylinder; wherein the control unit operates conditionally only when the pressure generated by the auxiliary cylinders is less than the pressure in the master cylinder; mounting the rear brakes on the rotary flange through . brake anchor plate for braking wheels, wherein the front brakes are connected to the front axle and are connected to the master cylinder through the control unit; and connecting auxiliary cylinder to each of the front brakes for transmitting the hydraulic braking pressure to the front brakes, wherein the auxiliary cylinders are disposed in the vicinity of the rear wheels of the vehicle.
OBJECTS OF THE DISCLOSURE
In one embodiment, an object of the disclosure is to provide a smart braking hydraulic system which utilizes the rear braking effect for braking the front brakes of the vehicle.
In one embodiment, an object of the disclosure is to provide a method of smart braking hydraulic system which utilizes the rear braking effect for braking the front brakes of the vehicle.
SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
In one embodiment, the present disclosure relates to a hydraulic brake system for a vehicle. The hydraulic brake system comprises a master cylinder coupled to a brake pedal of the vehicle for displacing a brake fluid to brakes. The master cylinder generates a hydraulic braking pressure in response to a brake pedal operation. Rear brakes are mounted on a rotary flange through a brake anchor plate for braking rear wheels, wherein front brakes are connected to the master cylinder through a control unit. An auxiliary cylinder connected to each of the front brakes for

transmitting hydraulic braking pressure to the front brakes, wherein the auxiliary cylinders are disposed in the vicinity of rear wheels of the vehicle. The control unit connected to the master cylinder, wherein the control unit operates conditionally only when pressure generated by auxiliary cylinder is less than the pressure in the master cylinder.
In one embodiment, the rear brakes are connected to a rear axle through the rotary flange and the rotary flange is in turn connected to the auxiliary cylinder through a radial arm.
In one embodiment, the auxiliary cylinder comprises a plunger, which is actuated by the radial arm for transmitting hydraulic pressure to the front brakes; and a body having a predetermined diameter and predetermined stroke along with a double acting piston, wherein the double acting piston is slideably disposed within the auxiliary cylinder.
In one embodiment, the control unit is a pressure compensator, which is fluidically connected between the front brakes and the master cylinder.
In one embodiment, the rotary flange is provided with predetermined rotational degree of freedom to transfer the hydraulic braking pressure to the auxiliary cylinders.
In one embodiment, a plurality of stoppers is provided on the rotary flange to prevent bottoming of the auxiliary cylinders.
In one embodiment, the rotary flange is placed on bearing casing of the rear axle through plurality of bearings.
In one embodiment, the hydraulic brake system is provided with plurality of bleeding locations at the front brakes, the rear brakes, and the pressure compensator.
In one embodiment, the present is also relates to a method of operating a hydraulic brake system of a vehicle, the method comprises acts of generating hydraulic braking pressure of the fluid by applying pressure onto the brake pedal, wherein the generated hydraulic braking pressure supplies pressurized fluid to activates the rear brakes to activate the rotary flange, wherein the activation of the rotary flange activates the auxiliary cylinders to supply brake fluid to cylinders

of the front brake, activating braking action of the rear brakes by restricting rotation of the rotary flange when cylinders of the front brakes are filled up completely with hydraulic brake fluid.
In one embodiment, the present is also relates to a method of assembling a hydraulic brake system the method comprises acts of coupling the master cylinder to the brake pedal of the vehicle for displacing the hydraulic braking fluid to brakes, wherein the master cylinder generates the hydraulic pressure in response to brake pedal operation; connecting the control unit to the master cylinder; wherein the control unit operates conditionally only when the pressure generated by the auxiliary cylinders is less than the pressure in the master cylinder; mounting the rear brakes on the rotary flange through brake anchor plate for braking wheels, wherein the front brakes are connected to the front axle and are connected to the master cylinder through the control unit; and connecting auxiliary cylinder to each of the front brakes for transmitting the hydraulic braking pressure to the front brakes, wherein the auxiliary cylinders are disposed in the vicinity of the rear wheels of the vehicle.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
Fig. 1 illustrates the layout of conventional hydraulic brake system.
Fig. 2 illustrates the schematic representation of rear wheel end layout according to the present
disclosure.

Fig. 3 illustrates the schematic representation of the brake components according to the present disclosure.
Fig. 4 illustrates the schematic representation of the brake system according to the present disclosure.
Fig. 5 illustrates the schematic representation of the brake system during forward braking. Fig. 6 illustrates the schematic representation of the brake system during reverse braking. Fig. 7 illustrates the schematic representation of the brake system with rear brakes failed condition.
Fig. 8 illustrates the schematic representation of the brake system with front brakes failed condition.
Fig. 9 illustrates the schematic representation of the brake system showing all the bleeding locations according to the present disclosure-Fig. 10 illustrates the schematic representation of the bleeding of valve in the pressure compensator according to the present disclosure.
Fig. 11 illustrates the schematic representation of the bleeding of front brakes and auxiliary cylinder according to the present disclosure.
Fig. 12 illustrates the schematic representation of the bleeding of rear brakes according to the present disclosure.
Fig. 13 illustrates the graphical representation of the performance of the conventional and the disclosed brake system according to the present disclosure.
Fig. 14 illustrates the schematic representation of the rotary flange with double acting auxiliary cylinder according to the present disclosure.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter

which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
It is to be noted at this point that all of the above described components, whether alone or in any combination, are claimed as being essential to the invention, in particular the details depicted in the drawings and reference numerals in the drawings are as given below.
Table of referral numerals

Referral Numerals Description
1 Master cylinder
2 Brake Pedal
3 Rear brakes
4 Rotary flange
5 Control unit/compensator
6 Radial arm
7 Auxiliary cylinder
8 Front brakes
9 Plunger
10 Hydraulic braking system
11 Vehicle
12 Bleeding locations

13 Double acting piston
14 Brake anchor plate
15 Bearing casing
17 Front axle
18 Rear axle
19 Body of the auxiliary cylinder
20 Stoppers
21 Bearings
22 Axle tube
23 Valve
24 Bracket
Fig. 2 illustrates the schematic representation of rear wheel end layout according to the present disclosure. The rear wheel end layout comprises a rotary flange (4) connected between rear wheel brakes (3) and a rear axle (18). The rotary flange (4) is further connected with a rotary arm (6) to transfer the rotary motion to auxiliary cylinders (7). In an exemplary embodiment, front brakes (8) are energized by braking reaction of the rear brakes (3) of a vehicle (11) (not shown) having hydraulic brakes. The brake distribution is taken care by sizing the radial arm (6) length of rotating flange (4) and the diameter of auxiliary cylinders (7). Braking ratio chosen is fixed for empty and loaded vehicles. Hence, appropriate selection of braking ratio is a feature of the disclosed braking system.
Fig. 3 illustrates the rear brake mounting according to the present disclosure. In one embodiment of the present disclosure, an axle shaft of the vehicle (11) (not shown) is comiected to bearing casing (15) through the bearing (21). The bearing casing (15) is welded to the axle tube (22) and it is restricted to rotate. Above the bearing casing (15), a rotating flange (4) is mounted. The bearing casing (15) is not connected to brake anchor plate (14), it is provided to only locate the brake anchor plate (14). The brake anchor plate (14) is bolted to the rotary flange (4), in such a manner that it provides rotational degree of freedom by the rotary flange (4). The rotary flange (4) is provided with a radial arm (6) which is connected to pair of auxiliary cylinders (7). The auxiliary cylinders (7) are connected to the axle tube (22) through a bracket (24). The bracket

(24) is welded to the rear axle (18) such that it forms a static member. A plurality of stoppers (20) (Fig. 2) is provided in the rotary flange (4) in order to prevent bottoming of the auxiliary cylinder (7) in the event of fluid leak in the auxiliary cylinder (7).
In an exemplary embodiment of the disclosure, a hydraulic braking system (10) for a vehicle (11) is illustrated in Fig. 4. The hydraulic brake system (10) comprises a master cylinder (1) coupled to a brake pedal (2) of the vehicle (11) (not shown) for displacing a brake fluid to brakes of the vehicle (11) (not shown).
The master cylinder (1) of the present disclosure consists of a primary port (not shown) and a secondary port (not shown). The primary port of the master cylinder (1) is connected to the disc or drum brakes in the front axle (17) through a control unit (5). In one embodiment, the control unit (5) used in the present disclosure is a pressure compensator. The purpose of pressure compensator (5) is to make sure that the front brakes (8) always get energized by auxiliary cylinders (7) when the hydraulic braking system (10) is healthy. The pressure compensator (5) performs its act when there is a failure in rear brake circuit because of which the auxiliary cylinders (7) do not energize the front brakes (8). This is a failsafe mechanism to prevent total system failure in case of failure in the rear brake circuit. The threshold load of the plunger return spring in the pressure compensator (5) is designed in such a manner that it always keeps the plunger in its initial/rest position.
The master cylinder (1) generates a hydraulic braking pressure in response to a brake pedal operation. Rear brakes (3) are mounted on a rotary flange (4) through a brake anchor plate (14) for braking rear wheels, wherein front brakes (8) are connected to the master cylinder (1) through a control unit (5). An auxiliary cylinder (7) connected to each of the front brakes (8) for transmitting hydraulic braking pressure to the front brakes (8), wherein the auxiliary cylinders (7) are disposed in the vicinity of rear wheels of the vehicle (11). The control unit (5) connected to the master cylinder (1), wherein the control unit (5) operates conditionally only when pressure generated by auxiliary cylinder (7) is less than the pressure in the master cylinder (1).
The auxiliary cylinders (7) are disposed in the vicinity of the rear brakes (3) alternatively referred as rear wheel brakes for energizing the front brakes (8) alternatively referred as front

wheel brakes. The auxiliary cylinder (7) comprises a plunger (9), which is actuated by the radial arm (6) for transmitting hydraulic pressure to the front brakes (8); and a body (19) having a predetermined diameter and predetermined stroke along with a double acting piston (13), wherein the double acting piston (13) is slideably disposed within the auxiliary cylinder (7). In one embodiment, the hydraulic brake system (10) comprises two auxiliary cylinder (7) connected to two front wheel brakes.
As the brake distribution is taken care by auxiliary cylinder (7), there is no need for valves in the braking circuit. For example, in a Sport Utility Vehicles (SUVs) and Passenger Cars with engine in the front, the braking ratio is such that more than 60% of the braking is carried out by the front brakes (8). Hence, size of the auxiliary cylinder (7) and radial arm (6) of the rotary flange (4) are chosen in such a way that the pressure in the auxiliary cylinder (7) is more than that of the rear brakes (3).
Fig. 5 illustrates the schematic representation of the hydraulic brake system (10) during forward braking. During forward braking, the master cylinder (1) pressurizes the braking fluid through the secondary ports (not shown) of the master cylinder (1) to cylinders of the rear brakes (3). The pressurized brake fluid activates the wheel cylinder of the rear brake (3). When shoes of the rear brakes (3) expand and touch the drum, they tend to rotate the brake itself along with the rotary flange (4). The radial arm (6) connected to the rotary flange (4) starts pushing the plunger (9) of auxiliary cylinder (7) in the forward direction which causes the brake fluid to be displaced to the front brakes (8). When the front wheel cylinders are completely filled by the brake fluid due to the movement of the plunger (9) of the auxiliary cylinders (7), the rotation of the rotary flange (4) is restricted, causing braking of the rear wheels and consequential cum simultaneous braking in the front wheels. In the forward braking, the pressure in the rear wheel brakes (PR) is equal to the pressure in the master cylinder (PMC) and the pressure in the front wheel brakes (PF) is equal to pressure in the auxiliary cylinder (7) (PAUX), wherein the pressure in the auxiliary cylinder (PAUX) is always greater than pressure in the master cylinder (1) (PM).
Fig. 6 illustrates the schematic representation of the brake system during reverse braking. During reverse braking, i.e. braking of the rear brakes, the master cylinder (1) pressurizes the braking fluid through the secondary ports (not shown) of the master cylinder (1) to cylinders of the rear

brakes (3). The pressurized brake fluid activates the wheel cylinder of the rear brake (3). When shoes of the rear brakes (3) expand and touch the drum, they tend to rotate the brake itself along with the rotary flange (4) but in the opposite direction. The radial arm (6) connected to the rotary flange (4) does not actuate the auxiliary cylinder. However, the master cylinder sends pressurized fluid to one side of the pressure compensator (5) through its primary port (not shown). As the other side of the compensator piston (auxiliary cylinder side) has no pressure, the piston of the pressure compensator (5) moves forward, thereby generating pressure in the front and auxiliary cylinder circuits. This causes braking in both front and rear axles. In the reverse . braking, the pressure in the front wheel brakes (PF) is equal to the pressure in the rear wheel brakes (PR) which is equal to the pressure in the master cylinder (PMC) and the pressure in the auxiliary cylinder (7) (PAUX)-
Fig. 7 illustrates the schematic representation of the hydraulic brake system (10) with rear brakes failed condition. The tandem master cylinder/master cylinder (1) develops pressure in both the primary and secondary circuits. The primary and secondary circuits are the fluid connections between the primary and secondary compartments of the master cylinder (1) and brakes. Fluid connectivity is made through metal and rubber tubes. The primary circuit is the circuit which is responsible for braking action in the front wheel ends and the secondary circuit is responsible for the braking action in the rear wheel ends. As there is a failure in the rear brake circuit, rotary flange (4) will not undergo rotation to develop pressure in the auxiliary cylinder (7). As a result of this, there will not be pressure build up in the secondary circuit of the master cylinder (1). However, the primary compartment of the master cylinder (1) will develop pressure which will be transferred to the front circuit through the pressure compensator (5). This will create a back pressure in the auxiliary cylinder (7), which makes the plunger (9) of the auxiliary cylinder (7) to get attached to the body (19) of the auxiliary cylinder (7). Hence, bore of the auxiliary cylinders (7) should have a positive closure so as to prevent ejection of the plungers (9) during failure in the rear brake circuit.
Fig. 8 illustrates the schematic representation of the hydraulic brake system (10) when the front brakes are in failed condition. The master cylinder (1) develops pressure in both the primary and secondary circuits. The plungers (9) of the auxiliary cylinder (7) will not develop pressure due to leakage in the front circuit and the plungers (9) will get bottomed (i.e., the plungers will freely go

to the other end of the auxiliary cylinder (7) and get stopped by the cylinder body (19)). Thus, further movement of the plunger (9) is restricted by the body (19) of the auxiliary cylinder (7). Hence, rotation of the rotary flange (4) is prevented and braking in the rear brakes (3) starts. As a result of the failure in the front circuit, the plunger of the pressure compensator (5) moves to the other end, i.e. the plunger moves to left side of the pressure compensator (5). After brake application, the plungers of auxiliary cylinder (7) and the pressure compensator (5) comes back to their original position due to the presence of return springs.
Fig. 9 illustrates the schematic representation of the hydraulic brake system (10) showing all the bleeding holes (12) according to the present disclosure. Brake bleeding is the procedure performed on hydraulic brake systems whereby the brake lines (the pipes and hoses containing the brake fluid) are purged of any air bubbles. During the process of bleeding, brake pedal is pumped several times and the bleed screws at the respective locations are opened for the fluid to come out from the system along with air bubbles trapped in the system. Bleed screws (not shown) have to be closed once it is seen that there is no air bubble coming out. As the fluid is pumped out of the system constantly, it is essential that the fluid has to be poured into the brake fluid reservoir to make sure that the system does not get drained. The bleeding process is necessary because, while the brake fluid is an incompressible liquid, air bubbles are compressible gas and their presence in the brake system greatly reduces the hydraulic pressure that can be developed within the system. The same methods used for bleeding are also used for purging, where the old fluid is replaced with new fluid, which is necessary for maintenance. In the present disclosure, there are additional bleeding locations in addition to the bleeding locations at front brakes (8) and rear brakes (3). Hence, there will be totally four bleeding location along with bleeding locations/holes at the front brakes (8) and the rear brakes (3). A specific sequence for bleeding the hydraulic braking system (10) is disclosed.
Fig. 10 illustrates the schematic representation of bleeding of the pressure compensator (5) according to the present disclosure. As the pressure compensator (5) is located first in the subsystem in the layout, the pressure compensator (5) has to undergo bleeding operation first. While bleeding the pressure compensator (5), the valve (23) has to be closed and a bleed screw (not shown) of the front brakes (8) has to be kept in open position to facilitate forward movement of plunger in the pressure compensator (5) for bleeding.

Fig. 11 illustrates the schematic representation of bleeding of the front brakes (8) and auxiliary cylinder (7) according to the present disclosure. The next sub-system in the sequence as per the layout is the front brakes (8) and the auxiliary cylinders (7) which should follow the pressure compensator (5) for bleeding. At this stage of bleeding, the valve (23) in the pressure compensator (5) is kept in open position so that the fluid bypasses the pressure compensator (5) and the plunger of the pressure compensator (5) remains undisturbed. After bleeding, the valve (23) at the pressure compensator (5) is closed so that the pressure compensator (5) is not bypassed during braking.
Fig. 12 illustrates the schematic representation of bleeding of the rear brakes (3) according to the present disclosure. After bleeding of the pressure compensator (5), the front brakes (8) and the auxiliary cylinder (7), the last sub-system to undergo bleeding is the rear brakes or rear drum brake.
Fig. 13 illustrates the graphical representation of performance of the conventional hydraulic brake system and the disclosed hydraulic brake system (10) according to the present disclosure. With single acting pistons in the auxiliary cylinders (7), energizing front brakes will happen only when the vehicle goes in forward direction. In such cases, the pedal effort is higher than that in the forward direction. It can be addressed by making the auxiliary cylinder (7) as double acting cylinders as shown in Fig. 14. The double acting master cylinders are actuated by the radial arms in both the directions of vehicle movement and actuate the front brakes.
Fig. 14 illustrates the schematic representation of the rotary flange (4) with double acting auxiliary cylinder according to the present disclosure. The rotating flange (4) comprises plurality of radial arms (6) which are disposed on its upper surface such that the rotation provided to the rotary flange (4) pushes the radial arm (6) against the plunger of the auxiliary cylinder (7) both in forward and reverse braking. When the vehicle is moving in forward direction and the brake is applied, the radial arm (6) pushes one of the plungers inside the auxiliary cylinder (7) such that the cylinder displaces brake fluid to the front brakes (8). The other plunger of auxiliary cylinder is pushed until it touches the end cover mounted at the end of the cylinder. It operates in the same manner but in opposite direction for reverse braking.

Advantages
In one embodiment, the auxiliary cylinder (7) disclosed in the present disclosure is designed in
such a way that it is able to cater the pressure requirements of the front brakes (8) which takes
care of more than 60% of braking. Hence, the foot effort given on brake pedal can be sufficient
enough to actuate the rear brakes (3) which does 30 ~ 40% of the braking work. Therefore, there
is a substantial reduction in pedal effort eliminating the need for a vacuum booster and vacuum
pump.
In one embodiment, the hydraulic brake system is a brake force regeneration system.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.
Equivalents
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of

such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should, typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

We claim:
1. A hydraulic brake system (10) for a vehicle (11), comprises:
a master cylinder (1) coupled to a brake pedal (2) of the vehicle (11) for displacing a brake fluid to brakes of the vehicle (11), wherein the master cylinder (1) generates a hydraulic braking pressure in response to a brake pedal operation,
rear brakes (3) mounted on a rotary flange (4) through a brake anchor plate (14) for braking rear wheels, wherein front brakes (8) are connected to the master cylinder (1) through a control unit (5); and
an auxiliary cylinder (7) connected to each of the front brakes (8) for transmitting hydraulic braking pressure to the front brakes (8), wherein the auxiliary cylinders (7) are disposed in the vicinity of rear wheels of the vehicle (11), and
the controi unit (5) connected to the master cylinder (I), wherein the control unit (5) operates conditionally only when pressure generated by auxiliary cylinder (7) is less than the pressure in the master cylinder (1).
2. The hydraulic brake system (10) as claimed in claim 1, wherein the rear brakes (3) are connected to a rear axle (18) through the rotary flange (4), wherein the rotary flange (4) is in turn connected to the auxiliary cylinder (7) through a radial arm (6).
3. The hydraulic brake system (10) as claimed in claims 1 and 2, wherein the auxiliary cylinder (7) comprises:
a plunger (9), which is actuated by the radial arm (6) for transmitting hydraulic pressure to the front brakes (8); and
a body (19) having a predetermined diameter and predetermined stroke along with a double acting piston (13), wherein the double acting piston (13) is slideably disposed within the auxiliary cylinder (7).
4. The hydraulic brake system (10) as claimed in claim 1, wherein the control unit (5) is a
pressure compensator, which is fluidically connected between the front brakes (8) and the
master cylinder (1).

5. The hydraulic brake system (10) as claimed in claim 1, wherein the rotary flange (4) is provided with predetermined rotational degree of freedom to transfer the hydraulic braking pressure to the auxiliary cylinders (7).
6. The hydraulic brake system (10) as claimed in claim 1, wherein a plurality of stoppers (20) is provided on the rotary flange (4) to prevent bottoming of the auxiliary cylinders
(7).
7. The hydraulic brake system (10) as claimed in claim 1, wherein the rotary flange (4) is placed on bearing casing (15) of the rear axle (18) through plurality of bearings (21).
8. The hydraulic brake system (10) as claimed in claim 1 is provided with plurality of bleeding holes (12) at the front brakes (8), the rear brakes (2), and the pressure compensator.
9. A method of operating a hydraulic brake system (10) of a vehicle (11) as claimed in claim 1, the method comprises acts of:
generating hydraulic braking pressure of the fluid by applying pressure onto the brake pedal (2), wherein the generated hydraulic braking pressure supplies pressurized fluid to activates the rear brakes (3) to activate the rotary flange (4), wherein the activation of the rotary flange (4) activates the auxiliary cylinders (7) to supply brake fluid to cylinders of the front brake (8),
activating braking action of the rear brakes (3) by restricting rotation of the rotary flange (4) when cylinders of the front brakes (8) are filled up completely with hydraulic brake fluid.
10. A method of assembling a hydraulic brake system (10) as claimed in claim 1, the method
comprises acts of:
coupling the master cylinder (1) to the brake pedal of the vehicle (11) for displacing the hydraulic braking fluid to brakes, wherein the master cylinder (1) generates the hydraulic pressure in response to brake pedal operation;

connecting the control unit (5) to the master cylinder (1); wherein the control unit (5) operates conditionally only when the pressure generated by the auxiliary cylinders (7) is less than the pressure in the master cylinder (1);
mounting the rear brakes (3) on the rotary flange (4) through brake anchor plate (14) for braking wheels, wherein the front brakes (8) are connected to the front axle (17) and are connected to the master cylinder (1) through the control unit (5); and
connecting auxiliary cylinder (7) to each of the front brakes (8) for transmitting the hydraulic braking pressure to the front brakes (8),. wherein the auxiliary cylinders (7) are disposed in the vicinity of the rear wheels of the vehicle (11).