What are the signs that the brake booster is not working?

Today we’ll discuss several simple diagnostic tests for car brake boosters to help you check if the booster is working properly and identify potential problems. So if you’re experiencing any of these five warning signs that your car’s brake booster is failing, consider bringing your vehicle into the shop to have this component replaced before you’re put in harm’s way.

Signs of a Bad Brake Booster

If your brake booster is failing or it’s no longer functioning, it can affect your braking system as well as other systems. Signs can include:

Brake Pedal is Very Stiff. Since the brake booster operates with vacuum, the degree to which the brakes are more difficult to apply can vary. Often, the first application can be almost normal while subsequent applications shortly after get progressively harder.

It takes longer to stop your car. Since your braking power doesn’t have the necessary assistance from the booster, your stopping distance can increase.

Engine stumbling or stalling. If there’s a massive vacuum leak in the booster, it could draw more boost than normal when you apply the brakes. It takes vacuum away from other components, and it can cause your engine to stumble, the RPMs to drop, and your engine could stall.

The Check Engine Light can come on. The ABS light or other warning lights on the dashboard may illuminate if the booster has electronic components or is causing other system faults.

Whistling sounds. If you hear hissing, then the booster, or one of its seals or connections, might have a crack, break or leak. The hissing happens when you use the booster and air enters or leaves its system when it shouldn’t.

Fluid leaks. For hydraulic brake boosters, leaking fluid from the master cylinder can be a sign of failure.

Brake pedal position. Notice that your brake pedal is in a higher position than normal, you could be having a brake booster problem. If your brake pedal is raised higher up, you will not be able to stop as quickly when you need to suddenly.

Summary

If your car’s brake booster is failing, you will have a hard time stopping your vehicle, which can be dangerous. For safety reasons, please have your vehicle professionally maintained by a qualified mechanic, rather than attempting to repair the power steering yourself.

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