The vacuum booster is a tandem diaphragm vacuum suspended unit. During normal operation, with the brake pedal released, manifold vacuum is applied to both sides of the diaphragms. Applying the brakes allows air at atmospheric pressure to enter one side of each diaphragm. This pressure difference provides the power assist.

The booster assembly is located on the left front cowl. The master cylinder mounts on the booster assembly.

Power Brake Booster Check Valve And Hose

Vacuum is supplied to the power brake booster by a valve located on the intake manifold. A flexible hose connects the port to the power brake booster check valve. The power brake booster check valve mounts to a grommet on the front of the power brake booster.