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A shot of compressed air also gets them out but put a rag in the caliper to catch them. The usual reason the pistons don't want to go all the way in is a build up of crud on the outside of the exposed piston. Clean everything up, put in new seals and dust seals. Wet everything, inside of caliper cylinders, pistons and rubber parts with brake fluid before reassembling. Flush plenty of fresh fluid through the system before re-connecting the brake line, and wipe out any gunk in the master cylinder.
A shot of compressed air also gets them out but put a rag in the caliper to catch them. The usual reason the pistons don't want to go all the way in is a build up of crud on the outside of the exposed piston. Clean everything up, put in new seals and dust seals. Wet everything, inside of caliper cylinders, pistons and rubber parts with brake fluid before reassembling. Flush plenty of fresh fluid through the system before re-connecting the brake line, and wipe out any gunk in the master cylinder.