Installing Kelsey Hayes Caliper Pistons ?

Yep. If everything looks ok after you pop them out, you may only need to clean things up with a degreaser and put new seals in.
is there any chance that i may not be able to get the pistons out? on one of the calipers, 2 pistons on one side werent moving with the air, but i didnt try REAL hard either..I just dont want to spend the money only to find out i cant do it..