Brake Booster
Both models are equipped with a dual-diaphragm vacuum booster. The power brake booster is a dual diaphragm, vacuum assisted power brake booster. The booster reduces brake pedal pressure and travel distance. The booster is located on the left side of the bulkhead in the engine compartment, between the brake pedal and brake master cylinder. The booster is divided into separate chambers by the diaphragm and will not operate if vacuum is restricted or if any of the vacuum related power brake components fail. The brake booster is replaced as an assembly. If the power assist fails, the brake system will continue to operate with increased brake pedal effort. See Fig 1.
The power brake booster check valve is located on the front of the power brake booster. The check valve is positioned between the power brake booster and the power brake booster hose. It closes when the engine is turned off. In the closed position, it traps engine vacuum in the power brake booster and retains vacuum to provide several power assisted brake applications with the engine off.