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Thread: 95 m3 master cylinder replacement

  1. #1
    Join Date
    Nov 2004
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    95 BMW M Techniq SCCA Ep

    95 m3 master cylinder replacement

    Brakes on my 95 M3 absolutely suck. Have run 3 quarts of fluid through the system (note: race car, no ABS, Tilton rear bias valve) and they suck. I am considering removing the brake booster and replacing the MC with a smaller unit. Since the stock one is 25mm, what suggest you for a replacment?

  2. #2
    Join Date
    Oct 2003
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    Seattle
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    99 M3

    95 m3 master cylinder replacement

    Quote Originally Posted by Chuck Baader View Post
    Brakes on my 95 M3 absolutely suck. Have run 3 quarts of fluid through the system (note: race car, no ABS, Tilton rear bias valve) and they suck. I am considering removing the brake booster and replacing the MC with a smaller unit. Since the stock one is 25mm, what suggest you for a replacment?
    Soft pedal?

    There is a pretty good thread regarding replacement of the “bomb” - brake booster (oddly NLA in NA)- as it relates to soft pedal.

    Guys are sourcing them from Europe.


    Sent from my iPhone using Tapatalk
    Last edited by bluptgm3; 04-22-2018 at 12:57 PM.

  3. #3
    Join Date
    Jul 2010
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    '94 325iC, '08 328i, E93
    WAIT! What?

    Are you putting brake fluid in, then putting more brake fluid in, then more brake fluid in?

    If yes, then you are not having a master cylinder failure. The master cylinder can fail, and not a drop of fluid will be missing.

    If fluid is leaving the system then it leaving through a wheel cylinder/caliper or the clutch slave cylinder -- hydraulically in the same place in the respective circuits.

  4. #4
    Join Date
    Nov 2013
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    Oneida, NY
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    1993 318is/who to knows
    If the brakes suck, you would want a larger master cylinder. Not a smaller one. More master volume=more fluid pushed=stronger braking.

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