I race a cross country series in Oklahoma. Last saturday my rear brakes locked up on me. This is the third time this season that has happened. Each time has required a new rotor, new caliper, and new pads. I usually change pads every third race, unless it is extremely muddy, then more often. Does anyone have any suggestions as to what is causing this or a source for a better caliper or brake system?

 

sense you changed the caliper in the rear a few times and that did not fix the problem . I would change the master cylinder and flush out the system

 

Also just for good measure, if you haven't already done this. Replace the crappy stock brake line with a good braided stainless line, they work better.