Brake Booster Pump Description and Operation Right Drive

The power brake booster pump supplies the hydraulic pressure needed for power assist braking. The power brake booster system supplies hydraulic pressure to the hydraulic brake accumulator after the accumulator is discharged. When more hydraulic pressure is needed in the accumulator, the power brake booster pressure switch closes, energizing the power brake booster pump relay. The power brake booster pump motor runs to supply the additional hydraulic pressure to the accumulator.