SYMPTOMS OF A BAD BRAKE BOOSTER CHECK VALVE INCONSISTENT BRAKING? HARD TO PRESS BRAKE PEDAL? SPONGY?
Symptoms of a bad brake booster check valve. If you're experiencing difficulty pressing down the brake pedal or brake pedal feels spongy you might have a bad brake booster check valve. A check valve allows air to flow in one direction but not the other direction. The brake booster is able to maintain vacuum when the check valve is working properly. Top5autorepairs

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SYMPTOMS OF A BAD BRAKE BOOSTER

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