Brake Pads Replacement for GMC Truck GMC P42 Commercial Chassis 1999

Brake Pads Replacement Front

Notice: Do not allow calipers to hang from the flexible hoses. Doing so can damage the hoses.

1. Remove the caliper assembly.
2. Suspend the caliper.



3. Remove the inboard pad.
4. Remove the anti-rattle spring.
5. Remove the outboard pad.
6. Inspect the inside of the caliper assembly for signs of fluid leakage. If any is found, refer to Brake Caliper Overhaul .
7. Clean away any corrosion from the machined surfaces of the steering knuckle and caliper with a wire brush.

Notice: Make sure the brake hose is not twisted or kinked after installation. Damage to the hose could result.

1. Lubricate the caliper and anchor plate sliding surfaces with Delco Silicone Lube GM P/N 18010909 or the equivalent.



2. Install the inboard pad and anti-rattle spring.
3. Install the outboard pad.
4. Install the caliper assembly.

Important: Before moving the vehicle, pump the brake pedal several times in order to make sure the pedal is firm. Do not move the vehicle until you obtain a firm pedal. Check the brake fluid level in the master cylinder after pumping the brakes.

Brake Pads Replacement Rear

General Motors replacement brake lining material is recommended for this vehicle in order to maintain the balance between front and rear brake performance. General Motors replacement brake parts have been carefully selected to provide the proper brake balance for purposes of stopping distance and control over the full range of operating conditions. Installation of front or rear brake lining material with performance different from the recommended General Motors replacement parts can change the intended brake balance of this vehicle.

1. Remove the brake caliper. Refer to Brake Caliper Replacement .



2. Remove the inner brake pad from the brake caliper mounting plate.
3. Slide the outer brake pad along the rail in the brake caliper housing to the notches.
4. Lift the outer brake pad out.
5. Inspect the brake caliper. Refer to Brake Caliper Inspection .

1. Slide the outer brake pad into the brake caliper housing.
2. Install the inner brake pad onto the brake caliper mounting plate.
3. Install the brake caliper. Refer to Brake Caliper Replacement .

After the brake linings have been replaced and/or the brake rotors have been refinished, the new braking surface should be broken in, or burnished. Make 20 stops from 48 km/h (30 mph) using medium to firm brake pedal pressure. During this procedure, avoid overheating the brakes.