Quote: I've ran into situations where they are just tighter than I liked no matter what you did so I just turned the rotors to where they loosened up (not a street car)
Rickster
On factory style disc brakes, the seal between the piston and the piston bore is a square cut "O" ring. Besides the obvious seal, the square cut "O" ring will deform slightly when you apply the brakes. Upon brake release, that "O" ring will pull the piston back slightly as it goes back to it's normal shape. If it has been in there for a long time, it doesn't do that so very good no mo - even though it doesn't leak. I have seen that "high drag " scenario go away with just a caliper rebuild with new "O" rings and boots.
