If it fails, it can cause the brakes to operate weakly or not at all. The combined force then slows the vehicle quickly and easily.Ī check valve helps maintain vacuum in the brake booster. The rod transfers the force applied to the brake pedal to the diaphragm, which then forces the master cylinder piston. The vacuum inside the booster then pulls on a rod attached to the brake pedal. This can be helpful for heavy vehicles or those that have a harder time stopping at low speeds.Ī vacuum brake booster works by drawing air from the intake manifold and allowing it to travel through two chambers separated by a diaphragm. CausesĪ brake booster is a component of many vehicles that help boost braking pressure to make it easier to stop the car. This can be caused by leaks in the system, especially in the master cylinder and push rod. Depending on your engine type, this can result in a check engine light and stored trouble codes.Īnother common symptom of a failed brake booster is a soft or spongy brake pedal. This can cause a hard brake pedal, increased braking distance and even engine stalling.Ī bad brake booster can also affect the air-fuel mixture in your engine. When the brake booster check valve fails, it allows air into the vacuum hose that can significantly impact the effectiveness of the power brakes. The vacuum pressure boosts the force applied to the master cylinder and requires less effort from drivers to apply the brakes. When a brake booster is functioning properly, it creates a vacuum pressure inside the vacuum hose that feeds hydraulic brake fluid to the master cylinder. This is not a good thing and should be fixed as soon as possible. If you have a bad check valve, your brake pedal can become extremely hard to press down when you apply the brakes. If it fails to perform its job, air can enter your brake system and cause problems. The brake booster check valve is designed to regulate the vacuum inside of your vehicles vacuum brake booster when your engines running. 1.4 Replacement 2008 Ford Edge Brake Booster Check Valve
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