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850G front brake caliper axles

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    #1

    850G front brake caliper axles

    Hi all,

    I am still working on the front brakes on my 850G. My hypothesis is that the front calipers are not remaining close to the rotors. When I release the brake lever the calipers open up too far.

    I suspect the axles jointing the piston side (outboard) and the rigid side (inboard) are not moving freely enough.

    I greased all the axles but the lower ones with the rubber are very sticky. I ordered new lower axles and they didn't come with rubber. The parts fiche shows only the axles no rubber.

    Are my new axles missing the rubber? Is the rubber not needed? Is there some replacement for the rubber? What should I use to lube the axles?

    Thanks.
    Tags: None
    #2
    What year is your bike?
    79 GS1000S
    79 GS1000S (another one)
    80 GSX750
    80 GS550
    80 CB650 cafe racer
    75 PC50 - the one with OHV and pedals...
    75 TS100 - being ridden (suicidally) by my father

    Comment

      #3
      My '80 850 had that problem. The rubber had swollen up, probably from absorbing fork oil. Maybe even brake fluid, I dunno. Maybe a PO had used the wrong grease. Plenty of things were leaking up front when I got it. That was enough to make the caliper stick.

      I also ordered a new caliper axle to find that it doesn't include the rubber. I needed to replace a caliper anyway, so I made sure I got a new caliper axle bolt with the replacement caliper from eBay. I don't think I have a spare, or I'd send one to you. I remember seeing a lot of GS caliper bracket sets on eBay for not much money, so you shouldn't have too much trouble going that route.
      Dogma
      --
      O LORD, be gracious to me; heal me, for I have sinned against you! - David

      Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan
      --
       '80 GS850 GLT
      '80 GS1000 GT
      '01 ZRX1200R

      How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex

      Comment

        #4
        its an 1981.

        Dogma, thanks for the info and tip. The axle boots were swollen and sticky (have since been replaced). Think whatever chemical damaged the boots also damaged the axle rubber.

        Comment

          #5
          So has anyone found a solution to this front caliper axle rubber problem? Or a replacement rubber ring for it?
          My 850G has the same problem....the rubbers are swollen and they seize in the slide bore.
          I just bought new pins and they don't come with the rubber sleeves.

          Comment

            #6
            I've found through reading other threads the front rubber sleeves are prone to swelling when the wrong grease of cleaning agent is used.
            I read there was a recall at some point and the rubber sleeves were replaced with a metal sleeve with a slit in it that you pry slightly open and pop on the caliper axle.
            It still leaves me needing the rubbers or replacement sleeve. Dang.
            Another member said they put a number (5-7) ish o rings on the caliper slide pin and it worked.
            Once again, if anyone knows of a solution for this , let me know. It seems to have been a problem with the 80 and maybe up to 83 ish 850G's.

            Comment

              #7
              Sorry loud et, I have no advice but definitely have the same issue. If anyone can help please do!

              Comment

                #8
                I've experienced swelling of rubber parts before because they absorbed hydrocarbons. In this case a large O-ring for a fuel tank sending unit on a car. Washing off the O-ring and baking it at low temperature drove off the absorbed chemicals in the part and it shrunk back down to normal size. It may be a hail mary but you might try washing the plastic bushing and baking them for a few hours at 150F or so to see if you can reduce the swelling.
                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

                  #9
                  Originally posted by raygun View Post
                  Sorry loud et, I have no advice but definitely have the same issue. If anyone can help please do!
                  Yes, to be sure, we are talking about the rubber sleeve on the lower caliper slide? The rubber is about 1/2" diameter tube by 3/4" long?

                  Comment

                    #10
                    It can't hurt at this point Ed......I'll give it a whirl.

                    Comment

                      #11
                      Originally posted by loud et View Post
                      Yes, to be sure, we are talking about the rubber sleeve on the lower caliper slide? The rubber is about 1/2" diameter tube by 3/4" long?
                      Absolutely. I did the same thing as you, ordered an axle (odd name) from a parts site that didn't include the rubber bushing. So I've been looking for other options. Baking the rubber may be a good place to start but I'd still like new ones. These are brakes after all. Mine are not as bad as yours but they are a little swollen.

                      Comment

                        #12
                        Switch to using the Tokico twinpot Caliper. All the parts are available to rebuild those....
                        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

                          #13
                          Originally posted by salty_monk View Post
                          Switch to using the Tokico twinpot Caliper. All the parts are available to rebuild those....
                          Don't poke the bear Dan. Lol
                          When I started my 850 project I considered your twin pot upgrade.....I just cant.....New fork Springs and brake lines are next. Someday I'll do the conversion.

                          Comment

                            #14
                            Originally posted by loud et View Post
                            Don't poke the bear Dan. Lol
                            When I started my 850 project I considered your twin pot upgrade.....I just cant.....New fork Springs and brake lines are next. Someday I'll do the conversion.

                            Same. Poor grad student here. Gotta make do with what I have.

                            Comment

                              #15
                              Another thread on the subject

                              http://www.thegsresources.com/_forum...bolts-or-axles a user named "Bazzered" said 7 bucks each from a dealership. So I suppose that's an option

                              Comment

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