Vacuum Brake Booster: Description and Operation
Brake BoosterThe power brake booster is a dual diaphragm, vacuum-assisted power brake booster.
^ reduces brake pedal pressure and travel distance.
^ is divided into separate vacuum and atmospheric pressure chambers by a diaphragm.
If the power assist fails, the brake system will continue to operate with increased brake pedal effort.
Hose and Check Valve
The power brake booster check valve:
^ closes when the engine is turned off.
^ in the closed position, traps engine vacuum in the power brake booster.
^ retains vacuum to provide several power-assisted brake applications with the engine off.