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    Rear caliper conversion?

    While rebuilding my rear master cylinder, I realized I'm going to have to do the caliper as well. That got me thinking (and wondering) if anything newer, possibly 4 piston caliper, will be a direct bolt on. Has anybody done this and if so, what did you use?
    https://farm5.staticflickr.com/4442/...678005be58.jpg

    1982 GS1100 G converted by Motorcyclist magazine in 1986 to be a tribute to the Wes Cooley replica. 1982 Honda 900F. 1997 Yamaha VMax.
    Also owned: 1973 Kawasaki Z1 900, 1972 Honda 750 K, 1976 Yamaha XS 650, 1980 Kawasaki KZ 1000 MKII, 1978 Kawasaki SR 650. Current cage is a 2001 Mustang Bullitt in Dark Highland Green. Bought new in Sept. 2001.

    #2
    Originally posted by Deuce View Post
    While rebuilding my rear master cylinder, I realized I'm going to have to do the caliper as well. That got me thinking (and wondering) if anything newer, possibly 4 piston caliper, will be a direct bolt on. Has anybody done this and if so, what did you use?
    More brake on the rear is pointless, fix the OEM caliper and carry on.


    Mark
    1982 GS1100E
    1998 ZX-6R
    2005 KTM 450EXC

    Comment


      #3
      Im not even sure that front line sportbikes use 4 piston claipers out back.
      sigpic
      When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

      Glen
      -85 1150 es - Plus size supermodel.
      -Rusty old scooter.
      Other things I like to photograph.....instagram.com/gs_junkie
      https://www.instagram.com/glen_brenner/
      https://www.flickr.com/photos/152267...7713345317771/

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        #4
        true rear brake performance is a non-issue, but a few oz's of unsprung weight.....combined with a newer rotor....
        1983 GS 1100 ESD :D

        Comment


          #5
          Originally posted by greg78gs750 View Post
          true rear brake performance is a non-issue, but a few oz's of unsprung weight.....combined with a newer rotor....
          On a 550lb flexi-flyer running skinny bias ply tires with low tech shocks? Even Marc Marquez himself couldn't feel that difference. OP would be better off saving his money and spending it on an experienced riders course or a track day. Of course, that applies to most of us and the mods we do...


          Mark
          1982 GS1100E
          1998 ZX-6R
          2005 KTM 450EXC

          Comment


            #6
            I think it would only make it more likely to lock up and skid in a hard braking situation (like a panic stop).
            1982 GS1100E "Jolene"

            Comment


              #7
              bruh, free horsepower tho
              Originally posted by mmattockx View Post
              On a 550lb flexi-flyer running skinny bias ply tires with low tech shocks? Even Marc Marquez himself couldn't feel that difference. OP would be better off saving his money and spending it on an experienced riders course or a track day. Of course, that applies to most of us and the mods we do...


              Mark
              1983 GS 1100 ESD :D

              Comment


                #8
                Originally posted by greg78gs750 View Post
                bruh, free horsepower tho
                I know, it's hard to resist that.


                Mark
                1982 GS1100E
                1998 ZX-6R
                2005 KTM 450EXC

                Comment


                  #9
                  Originally posted by mmattockx View Post
                  On a 550lb flexi-flyer running skinny bias ply tires with low tech shocks? Even Marc Marquez himself couldn't feel that difference. OP would be better off saving his money and spending it on an experienced riders course or a track day. Of course, that applies to most of us and the mods we do...


                  Mark
                  Oh sure, I'll get right on that. I just needed a simple answer. Yes, there is, no there isn't. If yes, what will work. That's all I'm asking for.
                  https://farm5.staticflickr.com/4442/...678005be58.jpg

                  1982 GS1100 G converted by Motorcyclist magazine in 1986 to be a tribute to the Wes Cooley replica. 1982 Honda 900F. 1997 Yamaha VMax.
                  Also owned: 1973 Kawasaki Z1 900, 1972 Honda 750 K, 1976 Yamaha XS 650, 1980 Kawasaki KZ 1000 MKII, 1978 Kawasaki SR 650. Current cage is a 2001 Mustang Bullitt in Dark Highland Green. Bought new in Sept. 2001.

                  Comment


                    #10
                    There aren't many more modern calipers (that also wouldn't need rebuilding) that use a brake torque arm and mount above the swingarm, they all have swingarm brackets but something could be made to fit...
                    Maybe a cruiser?
                    I recently fitted a Ninja 300 Master cylinder (because it was cheap) - pretty simple and works great. Used Stock GS Caliper. If you look at that thread you'll see a pic of a small twin piston caliper someone used.
                    The Ninja one has the bleeder in the wrong place but could be made to work if you tapped & drilled the alternate bleeder location (as used on the KLR but with a different bracket).
                    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


                      #11
                      I get what your wanting, but as a few others have said, even modern super bikes run opposed twins like the oem GS rear calipers. A quad piston set up would be overkill. Here's a '99 -'07 Suzi Busa rear caliper....similar style but same concept -

                      Comment


                        #12
                        Btw- I believe that above Busa rear caliper would be under mounted and need a new swing arm torque arm mount welded on.
                        Here's a twin pot slider... with an oddball torque arm mount, but you see there's some potential there...
                        http://www.ebay.com/itm/SUZUKI-M109R-REAR-BRAKE-CALIPER-/252721596896?epid=1711861926&hash=item3ad76189e0:g :SvYAAOSwSypY-OWW&vxp=mtr


                        Comment


                          #13
                          Hunt around and you may find something useful. Match the rotor diameters from yours to the proposed new one or swap a new rear rotor and start from scratch. Had I any known leads I'd toss them to you, but a lot of folks who asked "can I?" researched on their own and found an answer...since there's no obvious answers here that might be your only recourse. And when you figure it out then we'd be coming to you-lol. {helpful as I can currently be - sorry}

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