Symptoms of a Bad or Failing Brake Master Cylinder

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Cost of Replacing a Bad or Failing Brake Master Cylinder

Common signs of a faulty brake master cylinder include abnormal brake pedal behavior, contaminated brake fluid, and the Check Engine Light turning on. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Brake Master Cylinder Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2007 Ford Explorer $202 $90.41 $112.00 22% $262.41
2008 Mitsubishi Eclipse $216 $104.33 $112.00 21% $276.33
2009 Mitsubishi Outlander $287 $147.23 $140.00 20% $362.23
2003 BMW 760Li $535 $464.97 $70.00 6% $572.47
2008 BMW X6 $616 $511.36 $105.00 8% $672.61
2007 Jaguar S-Type $449 $330.26 $119.00 12% $513.01
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How to Diagnose a Bad or Failing Brake Master Cylinder?

Brake master cylinder

The brake master cylinder is one of the most important components found on modern car braking systems. It serves as the main valve that pushes brake fluid through the brake lines so that the brake calipers can squeeze the pads against the rotors. It functions by pushing a metal rod through a cylinder to force fluid through the braking system to the wheels. One end of this rod is attached to the pedal and is actuated when the pedal is depressed. Usually a faulty brake master cylinder will produce a few symptoms that alert the driver that service may be required.

1. Abnormal brake pedal behavior

One of the first symptoms commonly associated with a bad or failing brake master cylinder is abnormal brake pedal behavior. The master cylinder is the component that generates all of the pressure for the braking system, and if it develops any sort of problems sealing or distributing pressure, this may be felt in the pedal. Over time, with constant use, the seals inside of the cylinder can wear out and form internal leaks. A bad brake master cylinder may result in a pedal that feels mushy, spongy, or that slowly sinks to the floor when depressed.

2. Contaminated brake fluid

Another symptom of a bad brake master cylinder is contaminated brake fluid. Brake master cylinders use rubber seals which can break down and wear out over time. When they do, they can contaminate the brake fluid and will turn it dark brown or black color. Aside from contaminating the fluid, a brake master cylinder with worn seals will also not be able to hold brake pressure as effectively and may also result in a mushy pedal or one that slowly sinks to the floor.

3. Check Engine Light comes on

Another symptom commonly seen for newer vehicles is an illuminated Check Engine Light. The braking systems on newer vehicles may have brake fluid level and pressure sensors installed in the master cylinder. These sensors are meant to detect any problem with the vehicle’s brake fluid pressure, which is generated by the master cylinder. If they detect that the pressure has dropped, it is possibly due to a problem with the master cylinder.

As the brake master cylinder is essentially the heart of the braking system and vital to reliable brake operation, it is an important component to the handling and safety characteristics of the vehicle. A vehicle with a bad brake master cylinder will have inoperable or compromised brakes, and therefore will be unsafe to drive. For this reason, if you suspect that your brake master cylinder is having a problem, have the brake system diagnosed by a professional technician from YourMechanic to determine if it the car needs a brake master cylinder replacement.

Check Engine Light
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Spongy Brakes
brake system

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Recent Brake Master Cylinder Replacement reviews

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YourMechanic Brake Master Cylinder Replacement Service

Average Rating

4.5/5

Number of Reviews

228

Rating Summary
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213
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Joel

18 years of experience
501 reviews
Joel
18 years of experience
Joel did a great job once again. This is the third time he's serviced my 2000 Toyota Sienna with over 350,000 miles on it. He's very conscientious and goes above and beyond, even with a difficult, high mileage car like mine. I highly recommend Joel and will definitely use him again.
2000 TOYOTA SIENNA - BRAKE MASTER CYLINDER - NEPTUNE BEACH, FLORIDA

Frank

12 years of experience
27 reviews
Frank
12 years of experience
he was on time ,polite ,professional.did the work quickly .work was done correctly..my car is difficult to work on.small car with no room to maneuver but he was able to get inside and get it done.
1977 MERCEDES-BENZ 450SL - BRAKE MASTER CYLINDER - DOWNERS GROVE, ILLINOIS

Jeremy

17 years of experience
147 reviews
Jeremy
17 years of experience
Jeremy is extremely dependable, knowledgeable and punctual. He always arrives on time and with the right parts for BOTH of my cars. He is thorough in his inspection and has been servicing my cars for well over a year now. We are also having him take care of our new 2016 now too. No oil change express shops here. Jeremy is highly recommended!
2001 FORD TAURUS - BRAKE MASTER CYLINDER - DELRAY BEACH, FLORIDA

Jamahl

17 years of experience
653 reviews
Jamahl
17 years of experience
Jamahl did a great job correcting my brakes problem. I am very impressed with his expertise and professionalism.
2010 CHRYSLER TOWN & COUNTRY - BRAKE MASTER CYLINDER - ORLANDO, FLORIDA

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