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.
- Remove the brake caliper from the vehicle. Front Brake Caliper Replacement
- Drain the brake fluid from the brake caliper.
- 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.
Place clean shop cloths between the brake caliper piston and the brake caliper housing.
- Carefully remove the brake caliper piston (1) by directing low pressure compressed air into the brake caliper hydraulic hose inlet.
- Remove the brake caliper piston and the shop cloths from the brake caliper housing.
Remove the piston dust boot seal (1) from the seal counterbore in the brake caliper and discard the dust boot seal.
Using a small wooden or plastic tool, remove the piston seal (1) from the brake caliper bore and discard the piston seal.
Remove the brake caliper bleeder valve cap (1) and bleeder valve (2).
- Inspect the brake caliper mounting bracket guide surfaces for corrosion and wear. Remove and replace the brake caliper mounting bracket if damaged or worn.
- Clean the brake caliper piston bores and seal counterbore with denatured alcohol, or equivalent.
- Clean the brake caliper piston with denatured alcohol, or equivalent.
- Dry the caliper piston bore and counterbore with dry, non-lubricated, filtered compressed air.
- Dry the brake caliper piston with dry, non-lubricated, filtered compressed air.
- Inspect the caliper bore for cracks, scoring, pitting, and excessive corrosion.
- If light corrosion is present in the caliper bore, attempt to remove the imperfection with a fine emery paper. If the imperfection cannot be removed, replace the caliper assembly.
- If cracks, scoring, pitting, and excessive corrosion are present in the caliper bore, replace the caliper assembly.
- Inspect the caliper piston for cracks, scoring, and/or damage. Replace the caliper piston if any of these conditions exist.
Do not use abrasives to clean the brake caliper pistons.