Quote:
Originally Posted by BillGrissom
For those that don't know, the only thing that retracts caliper pistons is a slight rotation of the square O-ring. There is no spring return. It works amazingly well, but only if the piston is free to slide. Some of the earliest front calipers on 60's Mustangs and Darts would get stuck from rust, which is how after-market Stainless Steel Brake Company got their start.
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I understand that the piston seal is supposed to retract the pads slightly, but in my experience it does not. It is common to have the pads drag on the disk when one turns the wheel by hand. This is normal. The pads are pushed back a bit by the bearing run out on the first few corners one takes after releasing the brakes. If you want to spin the wheel with out having the pads drag, you can kick both front and rear of the tire. This will push the pads back enough to allow the wheel to spin, but it takes a very firm kick.