At 13,000 miles the rear rotor dished. I replaced the rotor, installed EBC pads, and did another fluid flush. I've never paid attention to the caliper temperature before but I noticed the new bright silver rotor got dark within 20 miles on the first test ride. So I checked and it got hot to touch - about 125 degrees. This is with no rear brake use and minimal front braking to slow for the driveway and come to a stop. The front brakes were cool, maybe slightly warm. My thought was to bed in the new pads and rotor so on the next test ride I used the rear brake many times at several minute intervals. The caliper got very hot; into the mid 130's. Yesterday I went for a long multi hour ride and with no rear brake use and minimal front braking the caliper and rotor stayed warm. Around 100 degrees. The caliper slides easily on the well lubed pins. The pistons appear to extend and retract as they should. New fluid - everything appears normal.
Is there normally that much friction that the rear caliper runs warm to hot as I'm experiencing and I've never noticed? Or is something else up; pistons not retracting quite enough or some issue with the linked proportioning system?
Is there normally that much friction that the rear caliper runs warm to hot as I'm experiencing and I've never noticed? Or is something else up; pistons not retracting quite enough or some issue with the linked proportioning system?