8 Remove the caliper guide pins and clean them with Scotch Bright and WD40.
9. Using a large C-clamp, push the piston back into the caliper. Have one end of the clamp against the back side of the caliper piston while the other clamped on the back side of the outer caliper pad. Slowly tighten the clamp until the piston is compressed all the way back into the caliper. It should compress smoothly.
**Just replacing brake pads – skip to step 24.
10. Remove the caliper now that the piston has the clearance and twist the caliper to unscrew it and remove it from the brake line. Now the caliper is free.
****If not rebuilding the caliper, unbolt the caliper and suspend it using zip ties (or a coat hanger), so it is not hanging from the brake line. Secure it to the spring. – Skip to step 15
11. Put the caliper in a oil catch pan as this next step can get very messy. Put the 1” block of wood between the caliper and piston. Connect the compressed air hose to the brake line inlet. BE VERY CAREFUL and DO NOT HAVE ANY FINGERS IN THE WAY as when you add the compressed air, the piston will shoot out with a lot of force and can cause serious injury.
12. Add the compressed air to the caliper and the piston will pop out. Remove the air line and pull out the piston.
13. Using WD40 and a pad of Scotch Bright, clean the piston.
14. Remove the old dust boot and inner rubber brake seal.