Vacuum Brake Booster: Description and Operation

Brake Booster
The power brake actuation system includes a vacuum assisted brake booster, vacuum check valve, vacuum hose and aspirator. The vacuum hose delivers engine vacuum to the vacuum check valve. The vacuum check valve is a one-way valve that allows engine supplied vacuum to the booster, and closes when engine vacuum is removed. The brake booster utilizes engine vacuum to reduce the amount of effort required at the brake pedal to actuate the foundation brakes.