Description & Operation

Hydraulic Brake Booster (HBB) System consists of brake fluid reservoir, pressure accumulator, hydraulic pump motor, brake master cylinder and associated electrical components. System is connected to Anti-Lock Brake (ABS) system ECU to allow for ease of fault diagnosis and isolation.

Operation of brake pedal applies hydraulic pressure to front brakes assisted by brake booster and accumulator pressure. Rear brakes receive hydraulic pressure from accumulator directly. In the event of HBB pump motor failure, brake pressure to rear wheels will be lost. Brake system warning buzzer sounds in event of system pressure failure, or excessive pump motor operation.