There is a hole in the hose or a vacuum leak if it fails this test.Ī hard brake pedal can be the result of a restriction in the brake line, such as a bent brake line or foreign material in the brake fluid. Start the engine and let it run for a minute or two. The valve needs replaced it it fails this test.Ĭonnect an engine vacuum test gauge to the connection on the engine intake manifold. If the check valve is working properly air will flow out of the booster. If the check valve is working properly the air will not flow into the booster. Remove any retaining clips that hold the hose to the intake manifold connection, and slip the hose off the connection. Now locate the flexible vacuum hose that runs from the engine intake manifold to the vacuum booster. It is a dome shaped assembly mounted at the rear of the engine compartment on the driver's side. The booster or the valve needs replaced if it fails this test. If the pedal does not rise it indicates that the booster is not leaking and the check valve is working properly. Continue holding the pedal down for 30 seconds or so. Push and hold the brake pedal down with light but steady pressure, and turn the engine off. Start the engine and allow it to run at idle for a minute or two. The brake pedal should stop at a higher position with each pump, indicating that the booster is not leaking and the check valve is working properly. Turn the engine off and slowly pump the brake pedal five or six times. Replace the brake booster if it fails this test.Īllow the engine to run at idle for a minute or two. The brake pedal should drop slightly, indicating that the booster is working properly. Push and hold the brake pedal down with light but steady pressure. Turn the vehicle engine off and pump the brake pedal a few times to deplete any remaining vacuum in the power booster.
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