brake caliper

Brake Caliper Symptoms, Function & Replacement Cost

In Brakes by Magnus Sellén1 Comment

brake caliperBrake calipers are one of the three braking system components. And just like the other two, brake calipers are essential to bring your car to a halt. Therefore, their proper functioning needs to be ensured at all times.

Brake calipers work in tandem with brake rotors and brake pads to create friction and stop your car.

The Function of A Brake Caliper

The brake caliper receives its energy from the hydraulic system which is activated as soon as you press the brake. The master cylinder uses brake fluid to build pressure which forces a piston to move and create a force to restrict your car’s movement.

Bad Brake Caliper Symptoms

As time passes, the brake calipers age and lose their performance. The biggest reason behind this loss in performance is heat caused by friction. After all, the brake calipers are made of metal, so they feel the heat the most out of all the other braking components. When they do fail, they start to create a number of problems for the driver and the car, which are easily noticeable.

Leaking Fluid

Almost every major function of a car requires fluid or lubricant to work properly. The brake calipers work the same way. They use the brake fluid from the master cylinder to press on the brake rotors, which in turn stop the car. The fluid itself is restricted by a number of seals, however, when they fail, the fluid leaks and your brake calipers become unresponsive. The leaking fluid can be seen just below the brake calipers or the master cylinder nearby. You could also inspect brake fluid leakage from inside the engine bay where a container holds reserve brake fluid for emergency use. If that reserve is empty, it means your brake fluid has reached critical levels and you need to either refill the container or visit the mechanic to talk about resealing the master cylinder.

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Noise From The Brakes

The calipers make a very loud squealing noise when they are not working properly. You can also feel that the brakes are stiff or, conversely, very loose at times. If any of the above signs show, you can be sure your car’s brake calipers have failed or are nearing failure. Brakes are supposed to work smoothly without making much noise, so if they do make noise and you don’t get them checked, the whole braking system can deteriorate pretty quickly.

Swaying Vehicle

The brake calipers are activated when a piston near the master cylinder extends itself to create force. It is possible that the piston gets locked up in a certain position due to extreme wear and tear caused by heat and friction, resulting in the brake caliper locking in place. A locked brake caliper will cause a car to sway in one direction. Thus, if you feel your car is moving in one particular direction all of a sudden, you need to get your brake calipers checked. And while you are at it, get your sway bar inspected as well, because a problem with the sway bar has the same effect.

Car Takes Time to Stop

The brake calipers create the force that causes the car to stop. However, if the brake calipers are loose or not responding as normal, your car could take longer to stop. When this happens, it is a sign of failing brake calipers, which you should definitely get inspected. A certified mechanic will have the perfect knowledge to deal with this kind of issue.

Testing and Repairing Brake Calipers

Ideally, it is better to stop a problem in its tracks before it starts becoming dangerous. To do that, you need to have the proper knowledge to identify and fix the problem. Here we will discuss some methods to test and repair brake calipers.

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Testing brake calipers are not that difficult since, as mentioned above, the problem is easily identifiable when driving your car. However, it’s important to identify the exact cause of the problem: for example, a swaying car can be caused by brake calipers, but also if the sway bars or tie rod joints are malfunctioning. Therefore, the correct tests need to be conducted to differentiate between a brake caliper failure and a failure of other parts of the car.

First off, before you inspect anything mechanical, it is best to remember the basics and check the brake fluid levels. Most of the time, brake-related issues arise as a result of low brake fluid levels. Check the brake fluid container in the engine bay and make sure it has an ample amount of fluid. If the fluid is below the critical line, refill the fluid container using high-quality brake fluid.

Remember that brake fluid should not disappear; if the brake fluid is gone, you have a leakage or the brake pads are worn.

Once you have refilled the container, you need to make sure the container’s cap is tightly sealed in place. The last thing you want is the brake fluid leaking while you drive your car.

The second test involves driving your car in a secluded place. It could be an empty parking lot or an empty road at night. Just make sure there are no other cars around or any pedestrians nearby. Be sure to wear a seatbelt, and then start your car and drive in a straight line. You need to brake frequently and see if any of the aforementioned symptoms show themselves.

If they do, you need to look for other issues. For example, leave your steering wheel for a while and see if the car sways to one side. If it does, your brake calipers are not at fault, since such a motion is caused by faulty suspension components.

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After doing all that, if you still feel you cannot be sure about the problem, you need to visit the mechanic and get a professional diagnosis.

Replacement Cost

Unfortunately, there is not a lot you can do to repair a brake caliper. You can try to replace the sealings, but it won’t always help. The expertise required to do that can only be found with an experienced mechanic. Having said that, brake caliper repairs are not very expensive to repair or replace. A new one will cost you $100-$150 while the mechanic will charge you $100-$150 in labor costs.

Hello I'm Magnus, the owner and the writer of this website. I have been working with cars since I was 16 and I'm specialized with in-depth Automotive diagnostics. Also been driving drifting for the last 6 years. I'm here to give you answers to all your automotive questions and I hope that you enjoy our content.

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Comments
  1. replaced pads and rotors on 2005 grand caravan tested on road to adjust and see how far to push pedal down and it seemed to be ok, just took it out and the speed was 50 and it started to slow down, like I was pushing on the pedal and it seems like the piston is not releasing. Any tips/

  2. Due to a very high demand and high ammount of comments, you have to wait for some time for your car questions to get answered. If you want to get fast answers from a certified master technician you can ask your questions here:
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