After my last ride a few days ago, I reached down to feel my rotor and it was burning hot. Took the caliper off and noticed that the caliper piston dust cover was either worn or burned through. Got another one ($20.30!) and put it on today. In addition, I drained the system and ran everything through the ultrasonic cleaner. Rinsed and dried, I reassembled the system and bled the brake. Spun the front wheel and noted a great deal of drag. For what it's worth, I have a new USA Motorcycle Master Cylinder, a new braided brake line, a new caliper seal, and fairly new pads. Obviously the piston is not releasing properly. Any ideas?