What is a brake booster?
The modern brake booster is a brilliant device that operates using engine vacuum, engine vacuum is generated whenever the engines running. The brake booster takes engine vacuum via a rubber hose that runs from the intake manifold. The brake booster uses that vacuum to amplify the pressure you put on the pedal ensuring that your car stops more rapidly. What happens to the brake booster if your car stalls and loses it’s vacuum? Engineers realized early on that gas engines were not foolproof, so they engineered a check valve within the brake booster circuit. The brake booster stores enough vacuum to provide full boost for two or three pedal applications after the engine stalls. The check valve on the brake booster is what keeps that vacuum from leaking out. If the brake booster can’t hold vacuum its time is up and you’ll need a new or remanufactured brake booster.
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