Vacuum Brake Booster Check Valve: Description and Operation

Hose and Check Valve
The power brake booster check valve:
- is located on the front of the power brake booster.
- is positioned between the power brake booster and the power brake booster vacuum hose.
- closes when the engine is fumed 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.