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1. (WO2018224236) VEHICLE BRAKE SYSTEM AND METHOD OF ASSEMBLING
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CLAIMS

What is claimed is:

1. A brake system for a four-wheel vehicle comprising:

a driver unit including a brake pedal operable to receive a user input;

at least one user input sensor operable to detect the user input;

a front axle brake unit fluidly isolated from the driver unit and including an

electronically-controlled fluid pressure generating unit and at least one control valve, wherein the front axle brake unit is operable to supply fluid pressure to at least one front axle wheel cylinder in response to the at least one user input sensor; and

a rear axle brake unit fluidly isolated from the driver unit and including an electronically-controlled fluid pressure generating unit and at least one control valve, wherein the rear axle brake unit is operable to supply fluid pressure to at least one rear axle wheel cylinder in response to the at least one user input sensor;

wherein the front and rear axle brake units include separate housings that are spaced at disparate locations of the vehicle, and

wherein the front and rear axle brake units each include their own dedicated fluid reservoir such that the front and rear axle brake units operate with supplies of hydraulic fluid that are separate from each other and uncoupled to the driver unit.

2. The vehicle brake system of claim 1 , wherein the rear axle brake unit is a first rear axle brake unit operable to supply fluid pressure to a first rear axle wheel cylinder, the vehicle brake system further comprising a second rear axle brake unit operable to supply fluid pressure to a second rear axle wheel cylinder,

wherein the first and second rear axle brake units include separate housings that are spaced at disparate locations of the vehicle, and

wherein the first and second rear axle brake units operate with entirely independent supplies of hydraulic fluid.

3. The vehicle brake system of claim 2, wherein the second rear axle brake unit includes its own dedicated fluid reservoir.

4. The vehicle brake system of claim 2, wherein the front axle brake unit is a first front axle brake unit operable to supply fluid pressure to a first front axle wheel cylinder, the vehicle brake system further comprising a second front axle brake unit operable to supply fluid pressure to a second front axle wheel cylinder,

wherein the first and second front axle brake units include separate housings that are spaced at disparate locations of the vehicle, and

wherein the first and second front axle brake units operate with entirely independent supplies of hydraulic fluid.

5. The vehicle system of claim 4, wherein the second front axle brake unit includes its own dedicated fluid reservoir.

6. The vehicle brake system of claim 2, wherein each of the first and second rear axle brake units includes a single switchable valve.

7. The vehicle brake system of claim 1, wherein the front axle brake unit is a first front axle brake unit operable to supply fluid pressure to a first front axle wheel cylinder, the vehicle brake system further comprising a second front axle brake unit operable to supply fluid pressure to a second front axle wheel cylinder,

wherein the first and second front axle brake units include separate housings that are spaced at disparate locations of the vehicle, and

wherein the first and second front axle brake units operate with entirely independent supplies of hydraulic fluid.

8. The vehicle brake system of claim 1, wherein the electronically-controlled pressure generating unit of the front axle brake unit is a motor-driven plunger.

9. The vehicle brake system of claim 1, further comprising a sensor operable to provide the signal to the controller, wherein the sensor is one of a pressure or travel sensor.

10. The vehicle brake system of claim 1, wherein the driver unit further comprises feel simulator coupled to the brake pedal to receive the user input.

11. A method of installing a vehicle brake system comprising:

installing a driver unit to the vehicle, the driver unit including a brake pedal operable to receive a user input;

providing a front axle brake unit and a rear axle brake unit, each of the front and rear axle brake units being transported to a location of the vehicle installation in a fluid-filled and pre-sealed state;

installing the front axle brake unit to the vehicle, the front axle brake unit including an electronically-controlled fluid pressure generating unit and at least one control valve in fluid communication with at least one front axle wheel cylinder, the front axle brake unit being installed at a first position in the vehicle proximate a front axle position and spaced from the driver unit;

installing the rear axle brake unit to the vehicle, the rear axle brake unit including an electronically-controlled fluid pressure generating unit and at least one control valve in fluid communication with at least one rear axle wheel cylinder, the rear axle brake unit being installed at a second position in the vehicle proximate a rear axle position and spaced from both the driver unit and the front axle brake unit;

wherein the front and rear axle brake units are installed with entirely independent supplies of hydraulic fluid, and both the front and rear axle brake units are maintained in fluid isolation from the driver unit.

12. The method of claim 11 , wherein the rear axle brake unit is a first rear axle brake unit in fluid communication with a first rear axle wheel cylinder, the method further comprising installing a second rear axle brake unit to the vehicle, the second rear axle brake unit including an additional electronically-controlled fluid pressure generating unit in fluid communication with a second rear axle wheel cylinder, the second rear axle brake unit being installed at a third position in the vehicle proximate the rear axle position, wherein the first and second rear axle brake units include separate housings and are not in fluid communication with each other.

13. The method of claim 12, wherein the front axle brake unit is a first front axle brake unit in fluid communication with a first front axle wheel cylinder, the method further comprising installing a second front axle brake unit to the vehicle, the second front axle brake unit including an additional electronically-controlled fluid pressure generating unit in fluid communication with a second front axle wheel cylinder, the second front axle brake unit being installed at a fourth position in the vehicle proximate the front axle position, wherein the first and second front axle brake units include separate housings and are not in fluid communication with each other.

14. The method of claim 11 , wherein the front axle brake unit is a first front axle brake unit in fluid communication with a first front axle wheel cylinder, the method further comprising installing a second front axle brake unit to the vehicle, the second front axle brake unit including an additional electronically-controlled fluid pressure generating unit in fluid communication with a second front axle wheel cylinder, the second front axle brake unit being installed at a third position in the vehicle proximate the front axle position, wherein the first and second front axle brake units include separate housings and are not in fluid communication with each other.

15. A brake system for a four-wheel vehicle having first and second axles spaced from each other in a fore-aflt vehicle direction, the brake system comprising:

a driver unit including a brake pedal operable to receive a user input;

at least one user input sensor operable to detect the user input;

a first axle brake unit including an electronically-controlled fluid pressure generating unit and at least one control valve, wherein the first axle brake unit is operable to supply fluid pressure to at least one first axle wheel cylinder in response to the at least one user input sensor; and

a second axle brake unit including a motor-on-caliper unit operable to apply a braking torque to a second axle wheel in response to the at least one user input sensor;

wherein the first and second axle brake units include separate housings that are spaced at disparate locations of the vehicle, and

wherein the first axle brake unit operates with a supply of hydraulic fluid that is not shared with the second axle brake unit.

16. The brake system of claim 15, further comprising a further second axle brake unit including a further motor-on-caliper unit operable to apply a braking torque to an additional second axle wheel in response to the at least one user input sensor.

17. The brake system of claim 15, wherein the first axle brake unit includes a physically-integrated dedicated fluid reservoir.

18. The brake system of claim 15, wherein the supply of hydraulic fluid of the first axle brake unit is not shared with the driver unit.

19. The brake system of claim 15, wherein the first axle brake unit is a self-contained unit having no external fluid communication other than with the at least one first axle wheel cylinder.