Rebuild
Caliper Assembly:
DISASSEMBLY
1. Remove the caliper assembly.
2. Remove brake pads.
3. Apply air pressure to the fluid port in the caliper with a rubber-tipped nozzle to remove the piston.
CAUTION: Do not use a screwdriver or any similar tool to pry piston out of bore. It will result in damage to piston. Cushion piston's impact against caliper when blowing it out of bore by placing a wooden block or shop towels between piston and caliper bridge.
4. Remove the dust boot from the disc brake caliper.
5. Remove the rubber piston seal from the disc brake caliper and discard it.
CLEANING AND INSPECTION
^ Clean all metal parts with isopropyl alcohol or brake parts cleaner. Then, clean out and dry the grooves and passageways with compressed air. Make sure caliper bore and component parts are thoroughly clean.
ASSEMBLY
1. Clean foreign material from caliper piston surfaces and lubricate with brake fluid before inserting into disc brake caliper.
NOTICE: Always install new piston seal and dust boot.
2. Start caliper piston into disc brake caliper housing by hand to ensure correct alignment.
3. When installing caliper piston back into bore, use wood block or another flat stock, like an old brake pad lining assembly, between C-clamp and caliper piston.
CAUTION: Do not apply C-clamp directly to caliper piston surface. This can result in damage to caliper piston. Be sure caliper piston is not cocked.
4. Ensure dust boot is tight in boot groove on caliper piston and in disc brake caliper.
5. Install disc brake caliper.