Question about 1982 Yamaha XJ 650

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Rear brakes won't release, increase friction as the disc heats up

I have a 2007 United Motors DST 200 dirtbike, and the rear brakes act strange. They seem fine at first, but as I drive the disc heats up, turning a darkish blue, and the brakes slowly increase friction whether I press the pedal or not, until I can barely get it to move in first gear from a stop. If I let them cool for a while, then it frees up again, until the disc heats up again from friction, I presume. That can't be good for the disc or pads, and is definitely not good for the rider! What can I do to fix it?

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Sounds like you have a piston freezing up i n the caliper or maybe even a faulty hose that has collapsed --take the caliper off, open the bleeder screw and try to press the piston in slowly with very little force--if it will not move in with ease--u have a bad caliper that will need replaced. also check the caliper slides make sure they are free

Posted on Jun 29, 2009


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Is the problems fix on your car? if its not, take it back and have them fix it correctly and it is a safety factor. to answer your question, its Yes and No, its not a common thing with any car, but it can happens to any cars. some car will experience the same problems with low miles and some with very high miles. The caliper which has a working piston pushing the pad in and out causing lots of heat and friction therefor causing the piston and the seal to fail over time due to heat; on the race car its glow red like a stove. when you release the brake the pressure is then release from the line and the piston retract back along with the pad although in this case the piston did not retract and stay extended pushing the pad to the disc causing the wheel to smoke, it like driving with emergency brake on. Again is not a common thing but it does happens and can happens to any cars. hope that help...

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