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  1. #1

    Default Master Cylinder is it Bad?

    How can I tell if my master cylinder needs to be rebuilt or replaced? 2001 suburban 1500 4x4. On a recent road trip the red brake light and ABS light come on and stay on. Then the next day no red brake light or ABS light. the brakes are soft to the touch and have recently been replaced.

  2. #2

    Davandy's Avatar
    Join Date
    Jun 2005
    Haasdonk Belgium


    Never take a change with brakes , if you can't diagnose it yourself let a professional take a look at it.
    Peter Smet
    Haasdonk, Belgium

  3. #3
    Jr. Mechanic
    Join Date
    Jul 2007
    Washington State, the Dry Side ( Southeastern)


    My 95' had a similar situation with the ABS Light and Brake light. The lights would flash on and off and sometimes stay on....long story short....2 problems ABS wheels sensor was shortening out and two the ABS module had hard fault codes that could not be fixed. Anyway.....You need to have a scope that can read the code to really figure out what is going can replace parts for a long time without a proper scope...Take it to someone that can diagnose the problem correctly.

    Don't mess around....ABS goes out you may not have brakes . period.
    Just Another Day in Paradise...

  4. #4
    TrailLeadr's Avatar
    Join Date
    Jun 2005
    Coventry, Rhode Island


    Quote Originally Posted by Dj Friction View Post

    Don't mess around....ABS goes out you may not have brakes . period.
    You're absolutely right. This has become my new quest to make sure people know that the ABS light doesn't only mean they may not work when needed, but could activate when they're NOT needed. Making it impossible for you to stop in time to avoid a catastrophy.

    Do the right thing, and take it to a qualified tech to diagnose.
    Rhode Island

  5. #5

    Default master cylinder

    thanks guys for your input. I just finished a 2000 mile trip and the brake and abs lights were on for the first half and not on for the second half of the trip. hopefully the dealer can diagnose without the lights on.

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