Disassembly Procedure
Do not place fingers in front of the caliper piston(s) in an attempt to catch or protect it when applying compressed air. The piston(s) can fly out with force and could result in serious bodily injury.
- Replace all the components included in the repair kits used to service this brake caliper.
- Lubricate the rubber parts with GM approved brake fluid from a clean, sealed brake fluid container to make assembly easier.
- If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of the brake system.
- The torque values specified are for dry, non-lubricated fasteners.
- Perform the service operations on a clean bench, free from all mineral oil materials.
- Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection
- Remove the brake caliper from the vehicle. Rear Brake Caliper Replacement (JL9, J56)
- CAUTION:
Use clean cloths to pad interior of caliper housing during piston removal. Use just enough air to ease the pistons out of the bores. If the pistons are blown out, even with the padding provided, it may be damaged.
Remove the brake caliper piston (1) from the caliper bore by directing low pressure compressed air into the caliper bore through the brake hose inlet port.
Using a plastic tool, remove the brake caliper piston dust boot seal (1) from the brake caliper housing.
Using a plastic tool, remove the brake caliper piston seal (1) from the brake caliper housing.
Remove the bleeder valve cap (1) and the brake caliper bleeder valve (2).
- Clean the brake caliper piston bore with denatured alcohol, or equivalent.
- Inspect the caliper bore for cracks, scoring, pitting and corrosion.
- If cracks, scoring, pitting or corrosion exists, replace the brake caliper.
Do not remove park brake piston apply spindle, washer or washer bearing.