Question about 2007 Chevrolet Malibu

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Master Cylinder? HELP!

I have a 2007 Chevy Malibu that I bought used from a dealership almost a year ago. Since I bought it, I've had issues. About six months ago, my ABS, Traction Control, and E-Brake lights came on and started to slowly leak brake fluid. I called a Chevy dealership in my area and they told me to change the brake pads. I changed them, lights were still on. Called them back, they told me to check the brake line. Had the line checked, everything was fine. They've since told me a couple of other things, I've done them all and the lights are still on. The barrings were all replaced right before I purchased the car. I called Chevy yesterday, and they told me it was probably the hub bearing and it would be $550 to replace. Since then, I've been researching online and spoke to my father who was a mechanic for several years, and I'm starting to believe it's my master cylinder. Is this possible? I'm tired of putting money into fixing all of these other things if it's actually the master cylinder that is messed up....Thank you!

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Hi Jacki, If you are losing brake fluid it must be leaking from somewhere and the places are limited. Fluid can leak from any one of the four wheel brake cylinders, the master cylinder, the ABS pump and valve unit, the master cylinder or cracked or broken metal or flexible brake pipes. Wherever the leakage is, it must be visible and detectable, as the fluid will make the area wet, If you look at each one of the four wheels, I'm sure one will have been marked by the leakage. The ABS / Traction control are separate from the Emergency brake warning light. The latter (E Brake) warns of loss of brake fluid. Whenever you top up it will extinguish, but illuminating again when the fluid has leaked out! The ABS and Traction control warnings will come on when an electronic signal fail to be transmitted and thereby triggering a fault code. These codes will be extinguished when the vehicle is connected to a scanner and the faults are deleted from the vehicle computers memory. You will most likely find that the wheel cylinder which is leaking has contaminated the pick up sensor which sends the signal to the ABS / Traction system. It will likely need removing, cleaning and then refitting. I am very sure that if you take a flashlight and lay down, even without crawling under the vehicle, you can identify where the leakage is, and point it out to those experts who it would seem have been misleading you. I doubt the leakage will be on the master cylinder, as having two unrelated faults would seem to be stretching coincidence a little far. (But I may be wrong and two problems may have come separately together! I believe the two are related to one wheel cylinder which has contaminated a sensors, The leakage is the most serious problem, as it can leave you without brakes! have that seen to very urgently! In fact NOW!!!! Regards John

Posted on Feb 22, 2012

  • Jacki Dorrell Feb 22, 2012

    The dealership told me it wouldn't be the sensors alone because of the way my car is set up?

  • Jacki That is what I have already told you too, but I believe the two faults are connected. Read through and do what I've suggested. Find that leakage first and I think the second problem will be easy to locate



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