4 Symptoms of a Bad Brake Booster (and Replacement Cost)

Last Updated on April 23, 2020

The Brake booster is a vacuum-powered part in your car which helps the brakes to work by asserting pressure on them. Without brake booster, brakes cannot work properly, and if you are not taking care of the bad brake booster, it will cause dangerous accident.

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Bad Brake Booster Symptoms

How do you know if your car has a bad brake booster? Here is a list of common systems of bad brake booster and what you can do to replace them:

#1 – Poor Braking Performance

Probably the most obvious symptom of a bad brake booster is the fact that despite having new brake pads, your car takes a longer distance to stop. It will feel like you must apply more pressure on the brakes and yet that doesn’t help. Sometimes pedals will not return unless you put a foot behind it to pull it up.

If you are facing this situation, you must look for brake booster and either consult the mechanic or examine it yourself. You should also keep in mind that hard brakes do not necessarily mean that they are due to bad brake booster. There can be any other related problems causing hard brakes.

#2 – Brake Pedal Hard to Press

Another common symptom of bad brake booster is that you must apply more force and effort to make the brakes work. Your vehicle can randomly be idle too.

#3 – Spongy Brake Pedal

As the issues with vacuum brake booster increase, they will ultimately do down to the brakes. The check valves are normally required to pump out the air however, when brake booster is not working properly, the excess air will move down to master cylinder.

Due to this, the pressure inside the brake lines decreases and brakes will be applied little softly giving you feeling that brakes have become little spongy while in actual they will take longer time to stop the vehicle.

When facing with such situation, it is important that you stop driving your car and consultant the professional mechanic to thoroughly inspect the entire brake system.

#4 – Engine Stalls

A brake booster works by using vacuum from the intake manifold. If the diaphragm inside the brake booster fails, excess air from the engine may enter the brake lines. This may result in your vehicle stalling.

Brake Booster Replacement Cost

For replacement parts, we recommend: PartsGeek.com

Though the overall costs to replace the bad brake booster depends upon your car and make however, generally the expenses range from $300 to $700. This cost can go up depending upon other factors but it is generally the average expense estimate for brake booster replacement.

You need to consult the right persons before deciding whether to replace them entirely or go for repair and maintenance.

Above are some simple tips on how you can detect the bad brake booster problems and what you need to know before opting for either complete replacement or servicing the same. Whatever your choices always do your homework and consult few mechanics and online sources to make more informed decision.


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