Brake Pad: Service and Repair

REMOVAL PROCEDURE
Use GM replacement brake lining material (or equivalent) for all GM vehicles in order to maintain the balance between front and rear brake performance. GM replacement brake parts have been carefully selected in order to provide the proper brake balance for stopping and control over a full range of operation conditions. Installation of front or rear brake lining material not recommended for this vehicle may change the intended brake balance.
1. Remove two-thirds of the brake fluid from the master cylinder.
2. Raise and suitably support the vehicle.
3. Mark the relationship of the wheel to the hub.
4. Remove the tire and wheel.





Install two wheel nuts in order to retain the rotor.
5. Push the piston onto the caliper bore in order to provide clearance between the pads and the rotor. Complete the following steps:
5.1. Install a large C-clamp (2) over the top of the caliper housing (1) and against the back of the outboard pad.
5.2. Slowly tighten the C-clamp until the piston pushes into the caliper bore enough to slide the caliper off the rotor.





6. Remove the lower caliper bolt (1).
7. Rotate the caliper (2) upward in order to access the pads.
8. Remove the pads (5) from the caliper bracket (3).
9. Remove the two retainers (4) from the caliper bracket.
10. Inspect the following parts for cuts, tears, or deterioration. Replace any damaged parts:
- The bolt boots.
- The piston boot.
11. Inspect the caliper bolts for corrosion or damage. If corrosion is found, use new parts, including bushings, when installing the caliper. Do not attempt to polish away corrosion.

INSTALLATION PROCEDURE





IMPORTANT:
- Before installing new brake pads, wipe outside surface of caliper boot clean. Use denatured alcohol.
- After bottoming the piston, lift the inner edge of the caliper boot next to the piston. Press out any trapped air. The boot must lay flat below the level of the piston face.

1. Bottom the piston into the caliper bore. If installing new brake pads, use a C-clamp in order to compress the piston. Use a metal plate or a wooden block across the face of the piston in order to protect the piston and the caliper boot.





2. Install the two retainers (4) to the caliper bracket (3).

IMPORTANT: The wear sensor is on the outside pad. Ensure that the sensor is positioned at the leading edge (upward) of the pad during forward wheel rotation.

3. Install the pads (5) into the caliper anchor bracket.
4. Lubricate the bolt (1) and the bolt boot using silicone grease.

NOTICE: Use care to avoid damaging pin boot when rotating caliper.

5. Swing the caliper (2) down onto the pads.

NOTICE: Refer to Fastener Notice in Service Precautions.

6. Install the lower caliper bolt.
- Tighten the caliper bolt to 85 Nm (63 ft lbs).
7. Remove the wheel nuts securing the rotor to the hub.
8. Install the tire and wheel. Align the previous marks on the wheel and the hub.
9. Lower the vehicle.
10. Fill the master cylinder to the proper level with clean brake fluid. Refer to "Master Cylinder Reservoir Filling"in Master Cylinder, Brakes.
11. Apply the brake pedal three times in order to seat the pads.
12. Burnish the pads and the rotors. Refer to "Burnishing Pads and Rotors" in Disc Brakes.