Tools Required
J 35777 Caliper Piston
Seal Installer
Removal Procedure
Caution: Refer to Brake Dust Caution in the Preface section.
Caution: Refer to Brake Fluid Irritant Caution in the Preface section.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.
- Remove the front brake caliper from the vehicle. Refer to
Front Brake Caliper Replacement
.
Caution: 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.
Notice: 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 from the caliper bore by directing
low pressure compressed air into the caliper bore through the fluid inlet
hole.
- Using
a small wooden or plastic tool, remove the caliper dust boot seal (2) from
the seal counterbore in the caliper (1) and discard the boot seal.
- Using a small wooden or plastic tool, remove the piston seal (4)
from the caliper bore and discard the piston seal.
- Remove the bleeder valve (5) and cap (6) from the caliper (1).
Important: Do not use abrasives to clean the brake caliper piston.
- Clean the brake caliper piston bore and seal counterbore, and the caliper piston
with denatured alcohol, or equivalent.
- Dry the caliper piston bore and counterbore, and the piston with non-lubricated,
filtered air.
- Inspect the caliper bore for cracks, scoring, pitting, excessive rust,
and/or excessive corrosion.
- If light rust or light corrosion are 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, excessive rust, and/or excessive corrosion
are present in the caliper bore, replace the caliper assembly.
- Inspect the caliper piston for cracks, scoring, and/or damage to the
finished surface area. Replace the caliper piston if any of these conditions
exist.
Installation Procedure
- Lubricate the new piston seal with Delco Supreme 11®, GM P/N 12377967
(Canadian P/N 992667), or equivalent DOT-3 brake fluid from a
clean, sealed brake fluid container.
- Install the lubricated, new piston seal into the caliper bore.
- Install the caliper piston into the caliper bore. Press the piston to
the bottom of the bore.
- Install the new piston dust boot seal over the piston.
- Use J 35777
to fully seat the caliper piston seal into the counterbore.
- Install the bleeder valve and cap to the caliper and tighten the valve
securely.
- Install the front brake caliper to the vehicle. Refer to
Front Brake Caliper Replacement
.