Claims:
1. A hydraulic braking system (100) for a vehicle, system (100) comprising:
a vacuum booster (3) with an input rod (12) operatively connectable to a brake pedal of the vehicle, wherein vacuum booster (3) is structured to amplify braking force received from the brake pedal;
a first hydraulic cylinder (1) and a second hydraulic cylinder (2), each configured to supply pressurized hydraulic fluid to at least one of first brake unit (8) and a second brake unit (9); and
a linkage assembly (200) connecting the vacuum booster (3) to the first hydraulic cylinder (1) and the second hydraulic cylinder (2);
wherein, the linkage assembly (200) is configured to distribute the braking force from the vacuum booster (3) equally to the first hydraulic cylinder (1) and the second hydraulic cylinder (2) for pressurising the braking fluid for operating the first brake unit (8) and the second brake unit (9).

2. The system (100) as claimed in claim 1, wherein the linkage assembly is coupled to an output rod (4) of the vacuum booster (3).

3. The system (100) as claimed in claim 1 wherein, the linkage assembly (200) comprises:
a first link (7) operatively connected to the output rod (4) of the vacuum booster (3); and
a second link (5) and a third link (6) operatively and equidistantly connected at either ends of the first link (7).

4. The system (100) as claimed in claim 3 wherein the output rod (4) is connected to a substantially central portion of the first link (7) between the either ends.

5. The system (100) as claimed in claim 3 wherein, the second link (5) and the third link (6) are oriented in a direction perpendicular to the first link (7).

6. The system (100) as claimed in claim 1 wherein, the second link (5) and the third link (6) of the linkage assembly (200) are operatively coupled a piston rod of the first hydraulic cylinder (1) and the second hydraulic cylinder (2), respectively.

7. The system (100) as claimed in claim 1 wherein, the first brake unit (8) and the second brake unit (9) are fluidly connected to an outlet port of the first hydraulic cylinder (1) and the second hydraulic cylinder (2), respectively.

8. The system (100) as claimed in claim 1 wherein, the first brake unit (8) corresponds to the brakes for front wheels of the vehicle.

9. The system (100) as claimed in claim 1 wherein, the second brake unit (9) corresponds to the brakes for rear wheels of the vehicle.

10. The system (100) as claimed in claim 1 wherein, the first hydraulic cylinder (1) has a smaller bore diameter and larger stroke relative to the second hydraulic cylinder (2).

11. The system (100) as claimed in claim 1 comprises, a vacuum circuit operatively connected to the vacuum booster (3).

12. The system (100) as claimed in claim 1 comprises, a brake fluid circuit operatively connected to the first hydraulic cylinder (1) and the second hydraulic cylinder (2).

13. The system (100) as claimed in claim 1, wherein the first hydraulic cylinder (1) and the second hydraulic cylinder (2) are single master cylinders.

14. A vehicle comprising a hydraulic braking system (100) as claimed in claim 1.
, Description:TECHNICAL FIELD

The present disclosure relates to the field of automobiles. Particularly, but not exclusively, the present disclosure relates to braking system for a vehicle. Further embodiments of the disclosure disclose hydraulic braking system with a dual cylinder arrangement for an automobile.

BACKGROUND OF THE INVENTION

Hydraulic brake systems are used in automobiles/vehicles to control or slow down the vehicle when needed. A typical hydraulic brake system consists of a brake booster which is coupled with a tandem master cylinder. When a driver depresses a brake pedal, hydraulic pressure is generated in the tandem master cylinder with the assistance of the brake booster. The hydraulic pressure generated in the tandem master cylinder is applied on a disc brake caliper or wheel cylinder assembly in case of drum brakes which is connected to the wheels of the vehicle. The disc brake caliper or wheel cylinder assembly converts the hydraulic pressure into brake force, which in turn is used to slow down or stop the vehicle.

Commonly known techniques for improving the performance of a vehicle braking system include power assisted braking mechanism that often uses a fluid pressure actuator, such as the vacuum booster, to assist/boost a driver-exerted force on a brake pedal of the vehicle.

However, it has been found that the existing vacuum assisted hydraulic brake system has limitations of being capable to utilize the brake system efficiently and sufficiently for heavy transport vehicles whose gross weight may be up-to 7.5 ton. For the vehicles bearing vehicle gross weight more than 7.5 ton, the existing vacuum assisted hydraulic brake system fails to provide desired brake performance. Further, there remains constraints on a size of the vacuum booster as their size cannot be increased beyond a certain limit due to vehicle packaging constrains. With introduction of Hydro booster Technology, current hydraulic brake system can be used only up to vehicle gross weight of 10.5 ton. Further, optimization for higher vehicle gross weight will result in changing the dimensions of the vacuum booster itself.

Currently, pneumatic S-cam braking systems are being used in the vehicles bearing weight above 7.5 ton. However, said pneumatic braking systems are expensive and heavier in weight in comparison to vacuum assisted hydraulic brakes.

Therefore, there remains a need for an improved hydraulic braking system for a vehicle and that is adapted to overcome the problems identified above. Specifically, there remains a need for a hydraulic braking system that is assisted by vacuum booster(s) and capable of being used in the vehicles bearing gross vehicle weight more than 7.5 ton, that is being operable at less brake pedal travel and input force, that is cheaper and light in weight.

The present disclosure is directed to overcome one or more limitations stated above, or any other limitation associated with the prior arts.

SUMMARY OF THE DISCLOSURE

One or more shortcomings of the conventional system or method are overcome, and additional advantages are provided through the provision of the method as claimed in 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 non-limiting embodiment of the disclosure, a hydraulic braking system for a vehicle is disclosed. The system includes a vacuum booster with an input rod operatively connectable to a brake pedal of the vehicle, where vacuum booster is structured to amplify braking force received from the brake pedal. A first hydraulic cylinder and a second hydraulic cylinder are configured to supply pressurized hydraulic fluid to at least one of first brake unit and a second brake unit. A linkage assembly connecting the vacuum booster to the first hydraulic cylinder and the second hydraulic cylinder is provided. The linkage assembly is configured to equally distribute the braking force from the vacuum booster to the first hydraulic cylinder and the second hydraulic cylinder for pressurizing the braking fluid to operate the first brake unit and the second brake unit.

In an embodiment of the disclosure, the linkage assembly is coupled to an output rod of the vacuum booster.

In an embodiment of the disclosure, the linkage assembly includes a first link operatively connected to the output rod of the vacuum booster. A second link and a third link is operatively and equidistantly connected at either ends of the first link.

In an embodiment of the disclosure, the output rod is connected to a substantially central portion of the first link between the either ends.

In an embodiment of the disclosure, the second link and the third link are oriented in a direction perpendicular to the first link.

In an embodiment of the disclosure, the second link and the third link of the linkage assembly are operatively coupled to a piston rod of the first hydraulic cylinder and the second hydraulic cylinder, respectively.

In an embodiment of the disclosure, the first brake unit and the second brake unit are fluidly connected to an outlet port of the first hydraulic cylinder and the second hydraulic cylinder, respectively.

In an embodiment of the disclosure, the first brake unit corresponds to the brakes for front wheels of the vehicle.

In an embodiment of the disclosure, the second brake unit corresponds to the brakes for rear wheels of the vehicle.

In an embodiment of the disclosure, a vacuum circuit operatively connected to the vacuum booster.

In an embodiment of the disclosure, a brake fluid circuit operatively connected to the first hydraulic cylinder and the second hydraulic cylinder.

In an embodiment of the disclosure, the first hydraulic cylinder and the second hydraulic cylinder are single master cylinders.

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 FIGURES

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 a schematic diagram of a hydraulic braking system, in accordance with an embodiment of the present disclosure.

Fig. 2 illustrates a schematic diagram of a linkage assembly in the hydraulic braking system, in accordance with an embodiment of the present disclosure.

The figure depicts 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 hydraulic braking system for the vehicle 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 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 disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiments disclosed may be readily utilized as a basis for modifying or designing other system 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. The novel features which are believed to be characteristics of the disclosure, as to its organization, 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.

In the present document, the word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or implementation of the present subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

While the disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will be described below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.

The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusions, such that a system that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such mechanism. In other words, one or more elements in the device or mechanism proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the mechanism.

Embodiments of the present disclosure discloses a hydraulic braking system for a vehicle. Existing vacuum assisted hydraulic brake system in vehicles has limitations of not being able to utilize the brake system properly and sufficiently for the vehicles bearing vehicle gross weight up-to 7.5 ton. For the vehicles bearing vehicle gross weight more than 7.5 ton, the existing vacuum assisted hydraulic brake system fails to provide desired brake performance. Further, there remains constraints on a size of the vacuum booster as their size cannot be increased beyond a certain limit due to vehicle packaging constrains.

Accordingly, the present disclosure discloses a hydraulic braking system for a vehicle. The system includes a vacuum booster with an input rod operatively connectable to a brake pedal of the vehicle, where vacuum booster is structured to amplify braking force received from the brake pedal. The system includes a first hydraulic cylinder and a second hydraulic cylinder are configured to supply pressurized hydraulic fluid to at least one of first brake unit and a second brake unit. A linkage assembly connecting the vacuum booster to the first hydraulic cylinder and the second hydraulic cylinder is provided. The linkage assembly is configured to equally distribute the braking force from the vacuum booster to the first hydraulic cylinder and the second hydraulic cylinder for pressurizing the braking fluid to operate the first brake unit and the second brake unit.

Further, the hydraulic braking system may be employed in any vehicle including but not limiting to heavy and light commercial vehicles, and passenger vehicles. However, neither the complete braking system nor the vehicle is illustrated in the figure for the purpose of simplicity.

The following paragraphs describe the present disclosure with reference to Figs. 1 and 2.

Fig. 1 illustrates a schematic diagram of a hydraulic braking system (100). The hydraulic braking system (100) is adapted to be assisted by a vacuum booster(s) and capable of being equipped in heavy vehicles, for example the vehicles bearing gross vehicle weight more than 7.5 ton, and this system may be capable of producing desired brake

The braking system (100) includes a vacuum booster (3) operatively connected between a brake pedal [not shown] and a linkage assembly (200). The brake pedal of the vehicle may be coupled to an input rod (12) of the vacuum booster (3). The input rod (12) may transmit the force exerted on the brake pedal to the vacuum booster (3). Further, an output of the vacuum booster may be configured with an output rod (4). The vacuum booster (3) may be configured for augmenting force exerted by the input rod (12). Within the scope of the present disclosure, the input rod (12) may extend through the vacuum booster (3) that includes a diaphragm (not shown), having a large area for generating vacuum and is connected to the input rod (12). The diaphragm separates and seals a forward fluid chamber of the vacuum booster (3) from a rear fluid chamber of the vacuum booster (3). The forward fluid chamber may be connected to a vacuum circuit (90), including a vacuum tank (92) and a vacuum pump (94), and the rear fluid chamber may be vented to atmosphere via a port. As the driver exerts the force on the brake pedal, the input rod (12) operates a control valve (not shown) in the vacuum booster (3), in a manner known in the art, to open the forward chamber to the vacuum circuit (90). As the vacuum circuit (90) evacuates the forward chamber, atmospheric air pressure in the rear chamber acting against the diaphragm area provides an additive force that substantially increases the input force by the input rod (12), in comparison to the force exerted on the input rod (12) by the brake pedal of the vehicle. This augmented force is further transmitted through the output rod (4) connected to the output of the vacuum booster (3). Accordingly, in said manner, the vacuum booster (3) augments the force applied to the brake pedal by the driver in a manner that causes the output rod (4) to provide substantially high braking force while keeping the force that the driver must apply to the brake pedal at a modest value. The output rod (4) of the vacuum booster (3) may be connected to the linkage assembly (200). The linkage assembly (200) may include two links (5 and 6) which are further connected to a first hydraulic cylinder (1) and a second hydraulic cylinder (2).

The first hydraulic cylinder (1) and the second hydraulic cylinder (2) may further be fluidly connected to a first fluid flow line (14) and a second fluid flow line (16). The first fluid flow line (14) may be configured to couple the first hydraulic cylinder (1) to a first brake unit (8) and second fluid flow line (16) may be configured to couple the second hydraulic cylinder (2) to the second brake unit (9). Additionally, the hydraulic braking system (100) of the present disclosure may include a brake fluid circuit (80) operatively connected to the first hydraulic cylinder (1) and the second hydraulic cylinder (2) for supplying fluid to the first hydraulic cylinder (1) and the second hydraulic cylinder (2). The brake fluid circuit (80) may include a brake fluid reservoir (82) containing the fluid and brake fluid lines (84) to supply the fluid from the brake fluid reservoir (82) to the first hydraulic cylinder (1) and the second hydraulic cylinder (2). The fluid supplied to the first hydraulic cylinder (1) and the second hydraulic cylinder (2) may be pressurized by the force exerted from the linkage assembly (200). The pressurized fluid at the first hydraulic cylinder (1) may be supplied to the first brake unit (8) and the pressurized fluid at the second hydraulic cylinder (2) may be supplied to the second brake unit (9) through the first fluid flow line (14) and the second fluid flow line (16), respectively. Further, the linkage assembly (200) and the cylinder (1 and 2) configuration between the vacuum booster (3) and the brake unit (8 and 9) is explained with greater detail below.

Fig. 2 illustrates a schematic diagram of the linkage assembly (200) in the hydraulic braking system (100). The linkage assembly (200) may include a first link (7) connected to the output rod (4) from the vacuum booster (3). The output rod (4) may be connected at a substantially central portion of the first link (7). Further, the connection between the output rod (4) and the first link (7) is configured such that, the first link (7) is oriented in a direction perpendicular to the output rod (4). The output rod (4) and the first link (7) may be connected together by any known mechanisms including but not limited to fasteners. The linkage assembly (200) also includes a second link (5) and a third link (6) which may be operatively and equidistantly connected at either ends of the first link (7) by any known mechanisms including but not limited to fasteners. The second link (5) and the third link (6) may be of equal dimensions and may be oriented in a direction perpendicular to the first link (7) and parallel to each other. The above linkage assembly (200) may be configured such that the augmented braking force from the output rod (4) is equally distributed to the second link (5) and the third link (6) through the first link (7).

As mentioned above, one end of the second link (5) and the third link (6) is connected to the first link (7). Whereas the other end of the second link (5) and third link (6) may be connected to the first hydraulic cylinder (1) and the second hydraulic cylinder (2) respectively. The first hydraulic cylinder (1) and the second hydraulic cylinder (2) of the hydraulic braking system (100) may be master cylinders for each of the brake units (8 and 9). Each of the first hydraulic cylinder (1) and the second hydraulic cylinder (2) may include a piston housed in a bore. The second link (5) and third link (6) may be connected to piston rods of the first hydraulic cylinder (1) and the second hydraulic cylinder (2) respectively. Further, the first hydraulic cylinder (1) and the second hydraulic cylinder (2) may each be defined with inlet ports and outlet ports. The inlet port of each of the first hydraulic cylinder (1) and the second hydraulic cylinder (2) may be fluidly coupled to the brake fluid reservoir (82) through the brake fluid lines (84). In an embodiment, the first cylinder (1) and the second cylinder (2) may be interchangeably connected to the second brake unit (9) and the first brake unit (8).

In an embodiment, at least one of the first hydraulic cylinder (1) and the second hydraulic cylinder (2) may be defined with a bore diameter that is smaller than the bore diameter of the other cylinder with a stroke length that may be larger than the stroke length of the cylinder. The cylinder with the smaller bore diameter and larger stroke length may be fluidly coupled to the first brake unit (8) by at least one of the first fluid flow line (14) and the second fluid flow line (16) whereas the other cylinder may be fluidly coupled to the other cylinder. Also, the at least one of the first brake unit (8) and the second brake unit (9) may be the brakes for the front wheels of the vehicle whereas, the other brake unit may be the brakes of the rear wheels of the vehicle. The piston force is directly proportional to a ratio of the area of the input end and the output end of the stepped internal bore. For instance, where the input end of the stepped internal bore has an area approximately twice as large as the area of the output end, the piston force derived by the piston rod will be approximately double than the force corresponding to the pressurised fluid at the first hydraulic cylinder pressure acting on the large end of the piston. In an exemplary embodiment, the bore of the first hydraulic cylinder (1) may be defined with the diameter that is smaller than the bore diameter of the second hydraulic cylinder (2). The first hydraulic cylinder (1) may also be defined with a stroke that is larger than the stroke of the second hydraulic cylinder (2). Further, in an exemplary embodiment, the first brake unit (8) is the brakes for the front wheel and the second brake unit (9) is the brakes for the rear wheels of the vehicle. Further, the first hydraulic cylinder (1) may be fluidly connected to the first brake unit (8) through the first fluid flow line (14). The first hydraulic cylinder (1) with the smaller bore diameter and larger stroke may pressurize the fluid to an extent greater than the second hydraulic cylinder (2). Also, the first hydraulic cylinder (1) may be fluidly connected to the first brake unit (8) by the first fluid flow line (14) for fulfilling a high pressure and high fluid volume requirement for front brakes of the vehicle so that the required additional force can be generated by front brakes. The second hydraulic cylinder (2) may be defined with a large bore diameter and small stroke length. Consequently, the second hydraulic cylinder (2) is configured to moderately pressurize the fluid for the second brake unit (9) at the rear wheels in the vehicle.

When the driver of the vehicle exerts force on the brake pedal of the vehicle to decelerate the vehicle, the force from the brake pedal is transmitted to the vacuum booster (3) through the input rod (12) connecting the brake pedal and the vacuum booster (3). The vacuum booster (3) augments the input force from the brake pedal and the augmented force from the vacuum booster (3) is transmitted through the output rod (4) connected to the output of the vacuum booster (3). The augmented force at the output rod (4) may further be transmitted to the first link (7). The force may further be equally distributed between the second link (5) and the third link (6) connected to the first link (7). The second link (5) and the third link (6) are connected to the piston in the first hydraulic cylinder (1) and the second hydraulic cylinder (2) respectively. Thus, the braking force from the vacuum booster (3) is distributed equally to the first hydraulic cylinder (1) and the second hydraulic cylinder (2). Each of the piston housed in each of the bore of the first hydraulic cylinder (1) and the second hydraulic cylinder (2) may pressurize the fluid in the first hydraulic cylinder (1) and the second hydraulic cylinder (2). The first hydraulic cylinder (1) with the small diameter and the large stroke pressurizes the fluid to large pressures. The highly pressurized fluid from the first hydraulic cylinder (1) may be circulated to the first brake unit (8) through the first fluid flow line (14). Also, the second hydraulic cylinder (2) with the large diameter and the small stroke length, moderately pressurizes the fluid. The moderately pressurized fluid may be circulated to the second brake unit (9) by the second fluid flow line (16).

In an embodiment, the linkage assembly (200) may equally distribute the output force from the vacuum booster (3) to the first hydraulic cylinder (1) and the second hydraulic cylinder (2). The configuration and orientation of the first hydraulic cylinder (1) and the second hydraulic cylinder (2) enables the supply of required pressurized fluid to the brake units (8 and 9) of the front wheels and the rear wheels of the vehicle.

In an embodiment, the above configuration of providing an individual cylinder for supplying pressurized fluid to the brake units in the front and rear wheels of the vehicle enables generation of the required pressure for operating the brake units in vehicles with gross weight greater than 7.5 ton. The above configuration provides improved performance at less brake pedal travel and input force.

In an embodiment, the linkage assembly (200) enables an equal distribution of the augmented force from the vacuum booster (3) to the cylinders (1 and 2) without any variations or dimensional changes to the vacuum booster (3).

In an embodiment, the above-mentioned system (100) provides a cost-effective and light weight configuration for braking in vehicles with gross weight greater than 7.5 ton and is a viable replacement to the conventional expensive pneumatic braking system for vehicles with large gross weight.

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, 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 description 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, 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 in the description.

Referral Numerals:

Referral numerals Description
1 First hydraulic cylinder
2 Second hydraulic cylinder
3 Vacuum booster
4 Output rod
5 Second link
6 Third link
7 First link
8 First brake unit
9 Second brake unit
12 Input rod
14 First fluid flow line
16 Second fluid flow line
80 Brake fluid circuit
82 Brake fluid reservoir
84 Brake fluid lines
90 Vacuum circuit
92 Vacuum tank
94 Vacuum pump
100 Hydraulic braking system
200 Linkage assembly