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 also suspected that any small amount of run out of the brake rotor. Just might help the retraction of the piston or pistons a little as well.
As calipers age. The pistons ability to slide easy is perhaps deteriorating as well. It is odd that the slight play in the bearings is also a factor I never considered this as well. Yet agree.
I have noticed a few times people doing brakes and not cleaning and lubricating the caliper slide systems. There are specific lubricants but others can be used with caution. This should always be done as well. It usually only takes a few minutes.