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Rear Calipers

WARNING: This page is about a different car, the 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Do not place your fingers in front of the piston in order to catch or protect the piston while applying compressed air. This could result in serious injury.
NOTE: 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.
NOTE: Replace all the components included in the repair kits used to service this brake caliper. Lubricate the rubber parts with new Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT-3 brake fluid 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.
NOTE: Required Tools: Universal Driver (J-8092) and Caliper Boot Seal Installer (J-45507)
  1. Remove the rear brake caliper from vehicle. See BRAKE CALIPERS  under REMOVAL & INSTALLATION.
  2. Remove the brake caliper piston from the caliper bore by directing low pressure compressed air into the caliper bore through the brake fluid inlet hole. Using a small wooden or plastic tool, remove the piston dust boot seal from the seal counter-bore in the caliper and discard the boot seal. Using a small wooden or plastic tool, remove the piston seal from the caliper bore and discard the piston seal.
  3. Remove the brake caliper bleeder valve cap. Remove the brake caliper bleeder valve. See Figure . 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 bore and seal counter-bore, with denatured alcohol, or equivalent.
  4. Clean the brake caliper piston with denatured alcohol, or equivalent. Dry the caliper piston bore and counter-bore, with non-lubricated, filtered air. Dry the caliper piston with non-lubricated, filtered 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. See Figure .
  5. Install the brake caliper bleeder valve. Tighten to specifications. See TORQUE SPECIFICATIONS  . Install the brake caliper bleeder valve cap. See Figure . Lubricate the NEW piston seal with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
  6. Install the NEW lubricated piston seal into the caliper bore seal groove. Make sure the seal is not twisted. Lubricate the brake caliper bore and the piston with brake fluid. Install the caliper piston into the caliper bore. Install the NEW piston dust boot seal over the piston.
  7. Assemble the Universal Driver and the Caliper Boot Seal Installer.
    1. Using Universal Driver and Caliper Boot Seal Installer fully seat the dust boot seal into the caliper.
    2. Make sure the caliper piston dust boot is properly seated into the groove in the brake caliper bore.
  8. Install the caliper to the vehicle. See BRAKE CALIPERS  under REMOVAL & INSTALLATION.
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