BRAKE SYSTEM WITH NORMAL NON-FAILURE AND MANUAL FRONT PUSH-THROUGH MODES

A brake system includes a reservoir and a master cylinder operable to provide a brake signal responsive to actuation of a brake pedal connected thereto. A power transmission unit is configured for selectively providing pressurized hydraulic fluid for actuating at least one of the pair of front wheel brakes and the pair of rear wheel brakes in a normal non-failure braking mode. A iso/dump valve arrangement is hydraulically interposed between the power transmission unit and a corresponding one of the wheel brakes. A fluid separator is hydraulically interposed between a selected one of the pair of front wheel brakes and a corresponding iso/dump valve arrangement. A normally open base brake iso valve is energized closed during normal non-failure braking mode. The base brake iso valve is open to place the master cylinder into fluid communication with at least one of the fluid separators during manual push-through braking mode.