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No Rear Brake Pressure -- "Kit" rebuild a good idea?

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    No Rear Brake Pressure -- "Kit" rebuild a good idea?

    Hi all,

    My 83 650L was knocked over when parked -- then the rear brake light wouldn't come on so I (idiotically?) pumped the brakes and, I think, ruptured the rear brake master cylinder (but the brake light works again...).

    There's now Zero rear brake pressure, I bled the brakes, took it to a mechanic as well who suggested I needed a new rear master cylinder.

    I'm considering getting a kit:


    Does anyone have experience with these kits?

    Is this something you'd recommend?

    Other thoughts/suggestions?

    Thanks!!

    Dave
    Last edited by Guest; 07-07-2010, 01:10 PM.

    #2
    Better to buy OEM replacement seals/Pistons than KL is the common experience here.

    You can still get them from Bikebandit. Check the piston bore isn't pitted to, if so look around for a good 2nd hand piece.
    1980 GS1000G - Sold
    1978 GS1000E - Finished!
    1980 GS550E - Fixed & given to a friend
    1983 GS750ES Special - Sold
    2009 KLR 650 - Sold - gone to TX!
    1982 GS1100G - Rebuilt and finished. - Sold
    2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

    www.parasiticsanalytics.com

    TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

    Comment


      #3
      Awesome. Thanks for the advice.

      They have the assembly for $170 (vs. $30 for the rebuild).

      I'd love to hear from anyone who has either done the rebuild, or who has replaced the complete assembly -- basically looking for information on:
      1) What kinds of issues were run into on the rebuild and

      2) How challenging/straightforward it might be to replace the complete assembly.

      Thanks!!!

      Comment


        #4
        Do as Salty Dan suggests and tear down the system. Removing the master cylinder piston is easy, and after cleaning it out you can inspect the inside with a flash light to see if there is any pitting. Same goes for the rear caliper; You can get new seals for the rear caliper if the pistons are not pitted, or get a piston kit that includes the seals if they are. While the system is torn down get yourself a teflon/stainless brake line. The only way to know what needs to be done is to tear down the system first.
        Ed

        To measure is to know.

        Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

        Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

        Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

        KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

        Comment


          #5
          Don't spend $170 on a new one, chances are your old one is rebuildable. I've rebuilt three rear masters on my bike and others using OEM rebuild kits (about $25) and all of them work like new.

          Comment


            #6
            Originally posted by DPage View Post
            Don't spend $170 on a new one, chances are your old one is rebuildable. I've rebuilt three rear masters on my bike and others using OEM rebuild kits (about $25) and all of them work like new.
            Chances are reasonable that you can simply install a master cylinder kit but you need to check the master bore carefully for pitting first. I've seen a goodly number of corroded masters from the inside out.
            Ed

            To measure is to know.

            Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

            Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

            Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

            KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

            Comment

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