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Re: Brakes

At 04:40 AM 8/18/2008, Dave Roos wrote:
Last year the front calipers on my 1994 R1100 RS started to stick to the point where if I kept going they would get so hot as to stop the bike. They would release after the bike sat for a few minutes. I ordered a caliper rebuild kit and all seemed to be OK but now they are doing the same thing. There is a bit of drag between the pads and the rotors but not a whole lot. The bike sits all winter and I am thinking that the problem may be the master cylinder as both rotors got hot. A few days ago the bike started to slow down after less than a mile and I believe the bike would have completely stopped if I had tried to keep going and both rotors were very hot. Before ordering a master cylinder rebuild kit I would appreciate any comments or suggestions. Can you also tell me what I should order. Is it just the piston in the master cylinder or are there seals also?



  You could have a defective MC or a bad hose.  Sometimes the hoses fail in
such a way that they block the fluid from moving back to the MC. I would try
to find the blockage first. When it fails, loosen the hose connection at the MC (after protecting any paint in the area) and see if the calipers release. If they do, it's probably the MC return port failing. If they don't release, it is probably
the hose from the MC to the splitter.