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1981 GS1100-- Master Cylinder LEAK!

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    1981 GS1100-- Master Cylinder LEAK!

    Can anyone help with advice on a constantly leaky master cylinder? When bike is just sitting-- it leaks (on side side or on center stand).



    What is the hole (in the center) designed for? How do I STOP this leak?

    Thanks,
    Mark...

    #2
    Time for a rebuild. Easy job assuming the cylinder bore is still in good shape. Hardest thing is getting in at the recessed circlip (you will need special plyers to get in there). Not sure about the hole but it looks like a drain for fluid that is getting past the outer cup.
    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

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      #3
      Originally posted by Nessism View Post
      Time for a rebuild. Easy job assuming the cylinder bore is still in good shape. Hardest thing is getting in at the recessed circlip (you will need special plyers to get in there). Not sure about the hole but it looks like a drain for fluid that is getting past the outer cup.
      Ditto.................................
      1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
      1985 GS1150ES stock with 85 Red E bodywork.

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        #4
        Thanks guys.

        Anyone have one they'd like to sell?? :-D

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          #5
          I bought a new rear OEM unit for my honda at a hefty expense, but brakes are not something you want to second guess.

          After I installed it, wow... worth the money.

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