CLAIMS

1. A braking system (4) for a motorcycle comprising:

- a first braking device (12) operatively connectable to a first wheel of the motorcycle, and provided with a first hydraulic supply circuit (16) ,

a first manually operated hydraulic device (20) provided with a first manually operated control (24) and a first hydraulic delivery circuit (28) fluidly connectable to the first hydraulic supply circuit (16) ,

- a second braking device (32) operatively connectable to said first wheel or to a second wheel of the motorcycle, and provided with a second hydraulic supply circuit (36) , distinct from or coinciding with the first hydraulic supply circuit (16) ,

a second manually operated hydraulic device (40) provided with a second manually operated control (44) and a second hydraulic delivery circuit (48) fluidly connectable to the second hydraulic supply circuit (36) , an electric actuator (52) having electric or electromechanical motor means (56) operatively connected to an electrically or electromechanically operated float (60) fluidly connected to a delivery (64) of the electric actuator (52) connected to said first hydraulic supply circuit (16) and/or to said second hydraulic supply circuit (36) ,

wherein said first and second hydraulic delivery circuits (28,48) are fluidly connected to each other by the interposition of valve means (68) ,

wherein the braking system (4) is provided with a processing and control unit (72) , operatively connected to said electric actuator (52) and to said valve means (68) , the processing and control unit (72) being programmed so that:

- in standard operation, in the event of operation of the first manually operated hydraulic device (20) and/or the second manually operated hydraulic device (40) , it translates the electrically or electromechanically operated float (60) so as to fluidly disconnect the first and/or the second hydraulic supply circuit (16,36) from the first and/or second hydraulic delivery circuit (28,48) and simultaneously operate the at least a first braking device (12) and/or the at least a second braking device ( 32 ) .

2. The braking system (4) according to claim 1, wherein the processing and control unit (72) is programmed so that :

in back-up operation, it backs up or allows the backing up of the electrically or electromechanically operated float (60) so as to allow the fluid connection between the first and/or the second hydraulic supply circuit (16,36) from the first and/or second hydraulic delivery circuit (28,48) and simultaneously operate the at least a first braking device (12) and/or the at least a second braking device (32) , when at least one between the first and the second manually operated hydraulic device (20,40) is operated.

3. The braking system (4) for a motorcycle according to claim 1, wherein said valve means (68) comprise a diverter valve (76) having a first inlet port (80) , fluidly connected to the first hydraulic delivery circuit (48) , a second inlet port (82) fluidly connected to the second hydraulic delivery circuit (48) , and a single outlet port (84) in fluid communication with the hydraulic delivery circuit, between said first and second hydraulic delivery circuit (28,48) , having greater pressure .

4. The braking system (4) for a motorcycle according to claim 1, 2 or 3, wherein the first hydraulic delivery circuit (28) is provided with at least one control valve (88) , which in standard operation connects the first hydraulic delivery circuit (28) to a first hydraulic braking simulator (92) and in back-up operation, connects the first hydraulic delivery circuit (28) to the first inlet port (80) of the diverter valve (76) , and/or wherein the second hydraulic delivery circuit (48) is provided with at least one control valve (88) , which in standard operation connects the second hydraulic delivery circuit (48) to a second hydraulic braking simulator (96) and in back-up operation, connects the second hydraulic delivery circuit (48) to the second inlet port (82) of the diverter valve (76) .

5. The braking system (4) for a motorcycle according to any one of claims 1 to 4, wherein the first manually operated device (20) is provided with a first hydraulic fluid tank (100) having a preloaded membrane which ensures an overpressure to compensate a different geodetic quota with respect to a second hydraulic fluid tank (104) of the second manually operated device (40) .

6. The braking system (4) for a motorcycle according to claim 1 or 2, wherein said valve means (68) comprise a slide valve (108) controlled by the processing and control unit (72) so that:

in the standard condition, the slide valve (108) fluidly separates the first hydraulic delivery circuit (28) , the second hydraulic delivery circuit (48) and the delivery (64) of the electric actuator (52) from each other, wherein said delivery (64) supplies said first and second hydraulic supply circuit (16,36) ,

in back-up mode, the slide valve (76) connects the first hydraulic delivery circuit (28) with the first hydraulic supply circuit (16) , and the second hydraulic delivery circuit (48) with the second hydraulic supply circuit (36) and wherein the slide valve (76) hydraulically separates the first and the second hydraulic supply circuit (16,36) .

7. The braking system (4) for a motorcycle according to claim 6, wherein the system (4) comprises a main hydraulic fluid tank (112) which supplies a first tank (100) of the first manually operated hydraulic device (20) and a second tank (104) of the second manually operated hydraulic device (40) , wherein said main tank (112) is preloaded, and wherein said preload is such as not to generate a pressure which determines an operation of the braking devices (12,32) , wherein said valve means (68) comprise a slide valve (76) which selectively connects or disconnects the first and the second hydraulic delivery circuit (28,48) with the first and the second hydraulic supply circuit (16,36) , respectively.

8. The braking system (4) for a motorcycle according to claim 6, wherein the system (4) comprises a first hydraulic braking simulator (92) connected to the first hydraulic delivery circuit (28) and a second hydraulic braking simulator (96) connected to the second hydraulic delivery circuit (48) , each of said hydraulic braking simulators (92,96) being provided with a single hydraulic tank (100,104) , wherein said valve means (68) comprise a slide valve (76) which selectively connects or disconnects the first and the second hydraulic delivery circuit (28,48) with the first and the second supply circuit (16,36) , respectively.

9. The braking system (4) for a motorcycle according to claim 6, 7 or 8, wherein said slide valve (76) is divided into four two-way valves (116) , preferably two normally closed valves and two normally open valves.

10. The braking system (4) for a motorcycle according to claim 1 or 2, wherein the system (4) comprises a single brake fluid tank (112) which supplies the first and the second hydraulic delivery circuit (28,48) , upstream of said valve means (68) , said single tank (112) being preloaded under pressure.

11. The braking system (4) for a motorcycle according to claim 10, wherein the first and the second hydraulic supply circuit (16,36) are fluidly connected to two braking devices (12,32) arranged at the front of the vehicle .

12. The braking system (4) for a motorcycle according to claim 1 or 2, wherein the first and the second hydraulic supply circuit (16,36) are coincident and fluidly connected to a single braking device at the rear of the vehicle .

13. The braking system (4) for a motorcycle according to claim 1 or 2, wherein said first and second manually operated hydraulic devices (20,40) are arranged in series with each other and with the first and second hydraulic supply circuit (16,36) , wherein each manually operated hydraulic device (20,40) comprises a piston provided with a one-way lip seal exiting the device itself.

14. The braking system (4) for a motorcycle according to claim 13, wherein the system comprises a brake fluid tank (112) connected directly upstream of the electric actuator by means of a plurality of series of one-way valves (120) which allow the leakage of fluid with the system at atmospheric pressure and at the same time prevent the passage in the opposite direction during the operations of the braking devices (12,32) both in standard operation and in back-up operation.

15. The braking system (4) for a motorcycle according to claim 13 or 14, wherein said valve means (68) comprise two normally open hydraulic valves (69) which fluidly connect both the manually operated hydraulic devices (20,40) and two normally closed hydraulic valves (70) to allow the passage of pressure between said manually operated hydraulic devices (20,40) and the hydraulic supply circuits (16,36) and prevent the absorption of volume by absorbers (92,96) connected to the manually operated hydraulic devices in backup.

16. The braking system (4) for a motorcycle (8) according to any one of claims 1 to 15, wherein said braking devices (12,32) comprise disc brakes and /or drum brakes.

17. A motorcycle (8) comprising a braking system (4) according to any one of claims 1 to 16.