Brake Caliper Mounting Plate Replacement C3500HD (Front)

Use the brake caliper mounting plate in order to mount all of the stationary brake components. An L or R following the part number cast on the back of the plates indicates left or right side mounting. Some plates may also have an L or R painted on the front.

1. Apply the parking brake.
2. Block the wheels.
3. Remove the brake caliper (3) . Refer to Brake Caliper Replacement .
4. Remove the hub and brake rotor (7) assembly. Refer to Brake Rotor Replacement .
5. Front Wheel Hub, Bearing, and Seal Replacement .
6. Remove the bolts (2) and washers.
7. Remove the brake caliper mounting plate .
8. Inspect the support rails for rust, corrosion, and wear.
9. Clean the support rails with a wire brush.
10. Inspect the brake caliper mounting plate for cracks or elongated bolt holes.

Replace the mounting plate if necessary.

1. Install the brake caliper mounting plate  to the steering knuckle.

Important: Ensure that the threads are clean and greaseless before applying threadlocker.

2. Apply 272® threadlocker to the threads of each brake caliper mounting plate bolt.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the bolts and washers.

Tighten

•	Tighten the brake shield (1) bolts to 26 N·m (19 lb ft).

•	Tighten the brake caliper mounting plate bolts to 105 N·m (78 lb ft).

4. Install the hub and brake rotor (7) assembly. Refer to Brake Rotor Replacement .
5. Front Wheel Hub, Bearing, and Seal Replacement .
6. Install the brake caliper (3). Refer to Brake Caliper Replacement .
7. Remove the blocks.

Brake Caliper Mounting Plate Replacement C3500HD (Rear)

1. Apply the parking brake.
2. Block the wheels.
3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
4. Remove the brake caliper (5). Refer to Brake Caliper Replacement .
5. Remove the brake rotor (with the hub). Refer to Brake Rotor Replacement .
6. Remove the bolts and washers.
7. Remove the brake caliper mounting plate (1) from the rear axle.

1. Inspect the support rails for rust, corrosion, and wear.
2. Clean the support rails with a wire brush.
3. Inspect the brake caliper mounting plate for cracks or elongated bolt holes.
4. Replace the mounting plate if necessary.

1. Install the brake caliper mounting plate (1) to the rear axle.

Important: Ensure that the threads are clean and greaseless before applying threadlocker.

2. Apply 272 Threadlocker GM P/N 12345493, or the equivalent, to the threads of each brake caliper mounting plate bolt.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the bolts and washers.

Tighten

•	Tighten the brake shield bolts to 32 N·m (24 lb ft).

•	Tighten the brake caliper mounting plate bolts to 220 N·m (162 lb ft).

4. Install the brake rotor (with the hub). Refer to Brake Rotor Replacement .
5. Install the brake caliper (5). Refer to Brake Caliper Replacement .
6. Lower the vehicle.
7. Remove the blocks.