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Newish brake master is leaking at res seals

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    Newish brake master is leaking at res seals

    Hi guys,

    Doing some while-you're-in-there bs on my car. A few years ago my (original?) brake master cylinder failed after a drive down the mountain, so I replaced it with an AZ one. Now I'm redoing a lot of stuff in my car and have turned my attention to the master cylinder. Check it out:



    As you can see it was leaking from the res seals. I had replaced the reservoir AND its seals a few years ago along with the new master. I read everything there is to read and made sure I did it correctly: I installed the seals into the master, then the res into the seals, then bench bled everything and then put it in the car using lots of paper towels.

    I'm planning on returning it under the lifetime AZ warranty and getting a clean one because it's going into this:



    but I don't want it to leak like it did before. As far as I can see, I did everything right. Why would it leak the way it did? I want to make sure it's done right this time because a brake fluid leak all over my new paint would be just be too much. Any input?


    it's a Kenny Powers quote on wheels

    #2
    Looks pretty rusty for only being a few yrs old.

    I bought new reservoir seals for mine from the dealer, were cheap as. Might be an option for you.

    Comment


      #3
      I still say get the new one and don't stress out about it. Make sure you press the reservoir in as tight as possible and don't spill any brake fluid when bleeding/ filling, and clean it up ASAP if you do

      Not to thread-jack but does anyone know how to fix a broken brake line flare tool?

      Sent from my moto g(6) using Tapatalk
      (OO=[][]=OO) For Life

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        #4
        I’ve had bad experiences with some of the aftermarket reservoir seals. At this point, I will ONLY use genuine ones, even on a fresh rebuilt master.
        2006 GMC Sierra 2500HD 4WD LBZ/Allison
        2002 BMW M3 Alpinweiß/Black
        1999 323i GTS2 Alpinweiß
        1995 M3 Dakargelb/Black
        - S50B32/S6S420G/3.91
        1990 325is Brilliantrot/Tan
        1989 M3 Alpinweiß/Black

        Hers: 1996 Porsche 911 Turbo Black/Black
        Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

        sigpic

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          #5
          Only thing I have to add is to lube the bushings with a little brake fluid before you put everything together. If you put it together dry, you could tear the seals.
          sigpic

          Comment


            #6
            ^ thanks guys. I had read to not let brake fluid contact the seals (which doesn't make sense really) so I'll be buying two genuine ones and lubing them up when I go to install.


            it's a Kenny Powers quote on wheels

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