Brake shoes contain asbestos, which has been determined to be a cancer-causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! The first step in brake repairs should be cleaning brake surfaces, using a commercially available brake cleaning fluid.
REMOVAL & INSTALLATION
- Follow Steps 1, 2 and 3 of the pad replacement procedure.
- Before removing the caliper mounting bolts, remove the bolt holding the brake hose to the caliper.
There are seals (washers) on each side of the brake hose at the caliper.
- Remove the Allen® head caliper mounting bolts. Inspect them for corrosion and replace them if necessary.
- Install the caliper and brake pads over the rotor. Mounting bolt torque is 38 ft. lbs. (51 Nm) for the caliper.
- Install the brake hose to the caliper. The brake hose fitting should be tightened to 33 ft. lbs. (45 Nm).
- Bleed the brakes, tighten the bleeder screw to 110 inch lbs. (13 Nm).
- Install the wheel and tire and lower the vehicle.
- Remove the caliper.
- Remove the pads.
- Place some cloths or a slat of wood in front of the piston. Remove the piston by applying compressed air to the fluid inlet fitting. Use just enough air pressure to ease the piston from the bore.
Do not attempt to catch the piston with your fingers, which can result in serious injury.
- Remove the piston boot with a flat tool or dull awl, working carefully so that the piston bore is not scratched. Special dental type tools are available from hardware and auto parts stores for special seal work.
- Remove the bleeder screw.
- Inspect the piston for scoring, nicks, corrosion, wear, etc., and damaged or worn chrome plating. Replace the piston if any defects are found.
- Remove the piston seal from the caliper bore groove using a piece of pointed wood or plastic. Do not use a screwdriver, which will damage the bore. Inspect the caliper bore for nicks, corrosion and so on. Very light wear can be cleaned up with crocus cloth. Use finger pressure to rub the crocus cloth around the circumference of the bore; do not slide it in and out. More extensive wear or corrosion warrants replacement of the part.
- Clean any parts which are to be reused in denatured alcohol. Dry them with compressed or allow to air dry. Don't wipe the parts dry with a cloth, which will leave behind bits of lint.
- Lubricate the new seal, provided in the repair kit, with clean brake fluid. Install the seal in its groove, making sure it is fully seated and not twisted.
- Install the new dust boot on the piston. Lubricate the bore of the caliper with clean brake fluid and insert the piston into its bore. Position the boot in the caliper housing and seat with a seal driver of the appropriate size, or G.M. tool J-26267.
- Install the bleeder screw, tightening to 110 inch lbs. (13 Nm). Do not overtighten.
- Install the pads, the caliper and bleed the brakes.