Front brake master cyclinder

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  • Guest
    #1

    Front brake master cyclinder

    I got the piston in the front brake master cylinder to move, and I can hear air moving through the hole where the brake hose goes. However, when I hooked it to the hose, filled it with fluid and pumped the handle, nothing came out. A few air bubbles come up. I took the screw out and pumped the handle again, but no fluid came out of the hole.

    I have not been able to remove the piston.
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    • GSXR7ED
      Forum LongTimer
      Past Site Supporter
      • Dec 2012
      • 10144
      • DE via L.A.
      #2
      Oh, man!

      That is going to be an adventure for you!

      I ended up gouging the piston and just bought a new one. Begins on Post #56:

      82GS750T - Seal, T/M Gear Shift Oil - The GSResources Forums
      https://www.thegsresources.com/_forum/showthread.php?216696-82GS750T-Seal-T-M-Gear-Shift-Oil/page2
      Place your 4 cylinder GS engine, drivetrain or clutch related questions in this forum.




      Got them pretty clean!


      Ed
      GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
      GS750TZ Parts Bike [Seq#6036]
      GSX-R750Y (Sold)

      my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

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        • Guest
          #3
          Here it is with the circlip, washer, and gasket removed. I haven't been able to get the piston out.15786190122846623654847335597287.jpg

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            • GSXR7ED
              Forum LongTimer
              Past Site Supporter
              • Dec 2012
              • 10144
              • DE via L.A.
              #4
              Ohhhhhhh!

              That was tough to get out!

              I have pic of that too! There's a special tool to pinch the circlip out. And I think I used a needle-nose to pull the piston out. Be careful not to scratch the cylinder walls.



              Ed
              Last edited by GSXR7ED; 01-09-2020, 09:33 PM.
              GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
              GS750TZ Parts Bike [Seq#6036]
              GSX-R750Y (Sold)

              my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

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                • Guest
                  #5
                  That's the thing... the piston won't come out.

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                    • GSXR7ED
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                      Past Site Supporter
                      • Dec 2012
                      • 10144
                      • DE via L.A.
                      #6
                      Keep your patience. Gently keep gripping it with pliers...it does loosen up...but the rubber is suctioning it.

                      It will eventually come out.

                      Ed
                      GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
                      GS750TZ Parts Bike [Seq#6036]
                      GSX-R750Y (Sold)

                      my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

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                        • Guest
                          #7
                          Originally posted by GSXR7ED
                          Keep your patience. Gently keep gripping it with pliers...it does loosen up...but the rubber is suctioning it.

                          It will eventually come out.

                          Ed
                          It sounds like there's a piece of metal inside stopping it from coming out. Did Suzuki make master cylinders that couldn't be opened?

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                            • Guest
                              #8
                              Here's me trying to remove the piston.

                              Brake Master Cylinder
                              https://vimeo.com/383925309
                              This is "Brake Master Cylinder" by Jasper Adkins on Vimeo, the home for high quality videos and the people who love them.

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                                • GSXR7ED
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                                  • Dec 2012
                                  • 10144
                                  • DE via L.A.
                                  #9
                                  Originally posted by ZombiePotatoSalad
                                  It sounds like there's a piece of metal inside stopping it from coming out. Did Suzuki make master cylinders that couldn't be opened?
                                  That piece of rubber around the Piston is part of the problem...it's suctioning the Piston from being removed.

                                  I kept at it for a couple of days while the other pieces were soaking in solvent. Eventually, it popped out.

                                  I had to learn patience. Just keep gently pulling at it...you are dislodging it gradually.

                                  Ed
                                  GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
                                  GS750TZ Parts Bike [Seq#6036]
                                  GSX-R750Y (Sold)

                                  my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

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                                    • cowboyup3371
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                                      • Apr 2010
                                      • 13996
                                      • In Ohio Now
                                      #10
                                      Is the circlip removed? Take a dental pick and pull the rubber boot out (you can get a new one)
                                      Cowboy Up or Quit. - Run Free Lou and Rest in Peace

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                                        • GSXR7ED
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                                          • Dec 2012
                                          • 10144
                                          • DE via L.A.
                                          #11
                                          Originally posted by cowboyup3371
                                          Is the circlip removed? Take a dental pick and pull the rubber boot out (you can get a new one)
                                          The circlip is removed...he's having issues pulling the Piston out.

                                          It's wedged in there tight because the rubber seal around the Piston must travel upward and out of the chamber.

                                          It takes time because of the suction the rubber is causing because it's been in there (probably) since the bike was built.

                                          Ed
                                          GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
                                          GS750TZ Parts Bike [Seq#6036]
                                          GSX-R750Y (Sold)

                                          my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

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                                            • Rich82GS750TZ
                                              Forum Guru
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                                              • Jun 2018
                                              • 5566
                                              • Mifflinburg, PA / Land of Tar & Chip
                                              #12
                                              might try removing the the reservoir and getting some penetrating oil (PB blaster?) in at it through the holes in there. Also let some PB sit on top of the plunger for a couple of days.
                                              Links
                                              ​

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                                                • GSXR7ED
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                                                  #13
                                                  Originally posted by Rich82GS750TZ
                                                  might try removing the the reservoir and getting some penetrating oil (PB blaster?) in at it through the holes in there. Also let some PB sit on top of the plunger for a couple of days.
                                                  I just watched the video OP posted and yes! The reservoir cap/lid needs to come off to let air flow through those tiny vents in the Master Cylinder.

                                                  Good call!

                                                  Ed
                                                  GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
                                                  GS750TZ Parts Bike [Seq#6036]
                                                  GSX-R750Y (Sold)

                                                  my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

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                                                    • salty_monk
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                                                      #14
                                                      Is it a concourse build? If not forget it & put one on from an EX650... Actually yours is probably single brake so look at the 250 or the KLR
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                                                        • Guest
                                                          #15
                                                          Originally posted by salty_monk
                                                          Is it a concourse build? If not forget it & put one on from an EX650... Actually yours is probably single brake so look at the 250 or the KLR
                                                          A what? What's a concourse build?

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