Yes, if I touch the hand brake at all while rolling backwards or anything at all it eventually locks up while riding. I have to stop and loosen the bleed valve to relieve the pressure. By then the brakes are usually smoking. As I mentioned before...I got a different caliper and rebuilt it. I also rebuilt the master cylinder. It still does the same thing. can't figure it out. I wonder if there is something floating around in the brake line itself. I don't know what else to do.The brake sticks on?
Yes, the pistons seem to work fine. For some reason it is not allowing the fluid to come back when the brake is released. What makes it even more strange is that doesn't happen right away. For instance...if I use the hand brake to stop from rolling backwards it might be 5 to 10 miles down the road before pressure builds to the point that the brakes start smoking. It seems to happen slowly. If I bleed off the pressure by releasing the bleed valve and never touch the hand brake again it seems to be fine. Very strange.Did you check and make sure that the pistons are releasing?