1979 GS850 - Rear Brake issues

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  • emlivings
    Forum Apprentice
    • Aug 2024
    • 37
    • Syracuse NY

    #1

    1979 GS850 - Rear Brake issues

    I just got done replacing the Points ignition to the Dyna S Ds3-2 system.
    The bike rips now which is a great thing.


    However, another issue cropped up. My rear calipers were on fire due a slight seizure.

    Looking to replace the rear rotors and caliper. Maybe i can get an OEM replacement off EBay but i think i may need to either get my rotors turned or get a aftermarket replacement. Thoughts?

  • Nessism
    Forum LongTimer
    GSResource Superstar
    Past Site Supporter
    Super Site Supporter
    • Mar 2006
    • 35792
    • Torrance, CA

    #2
    Full system teardown time. Master cylinder, caliper, replace brake line. And lube the physical brake pedal pivot bushing. Replace any corroded parts, like caliper pistons. Also recommended, replace the caliper and master rubber parts.

    This may not be what you wanted to hear, but it's the proper answer to a lasting and reliable brake system.
    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

    • Grimly
      Forum Guru
      Past Site Supporter
      Super Site Supporter
      • Sep 2012
      • 5771
      • Ireland

      #3
      Originally posted by emlivings
      I just got done replacing the Points ignition to the Dyna S Ds3-2 system.
      The bike rips now which is a great thing.


      However, another issue cropped up. My rear calipers were on fire due a slight seizure.

      Looking to replace the rear rotors and caliper. Maybe i can get an OEM replacement off EBay but i think i may need to either get my rotors turned or get a aftermarket replacement. Thoughts?
      That blasted rear caliper loves to sieze up just for fun, if it's neglected for just long enough - and ideally it should be rebuilt every decade or so.
      Hands up all who never do theirs? I thought so...
      Anyway, found out the hard way that it's easy enough and once done is good for another decade at least.
      Dave
      '79 GS850GN '80 GS850GT
      Only a dog knows why a motorcyclist sticks his head out of a car window

      Comment

      • emlivings
        Forum Apprentice
        • Aug 2024
        • 37
        • Syracuse NY

        #4
        Originally posted by Nessism
        Full system teardown time. Master cylinder, caliper, replace brake line. And lube the physical brake pedal pivot bushing. Replace any corroded parts, like caliper pistons. Also recommended, replace the caliper and master rubber parts.

        This may not be what you wanted to hear, but it's the proper answer to a lasting and reliable brake system.
        I ordered an OEM caliper off of ebay. brake lines would be an easy fix.
        Any recommendations if i wanted to go after market for some of these parts in the future?

        Comment

        • Nessism
          Forum LongTimer
          GSResource Superstar
          Past Site Supporter
          Super Site Supporter
          • Mar 2006
          • 35792
          • Torrance, CA

          #5
          Partzilla shows most of the seal parts, for both the master and rear caliper are available. I'd do a teardown so you can inspect everything. Don't buy used parts of unknown condition off Ebay, before you evaluate the parts you have already.

          Brakecrafters carries the top brake brands for all motorcycle makes/models. We are an authorized EBC retailer. Free USPS shipping on all US orders $25+.


          https://www.partzilla.com/catalog/su...le/1979/gs850g
          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

          • emlivings
            Forum Apprentice
            • Aug 2024
            • 37
            • Syracuse NY

            #6
            Originally posted by Nessism
            Partzilla shows most of the seal parts, for both the master and rear caliper are available. I'd do a teardown so you can inspect everything. Don't buy used parts of unknown condition off Ebay, before you evaluate the parts you have already.

            Brakecrafters carries the top brake brands for all motorcycle makes/models. We are an authorized EBC retailer. Free USPS shipping on all US orders $25+.


            https://www.partzilla.com/catalog/su...le/1979/gs850g
            Thoughts on Niche rotors? My OEM rotor is shot. from the heat.
            Attached Files

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