Silverado 1500 4WD V8-6.0L Hybrid (2009)
Brake Rotor/Disc: Testing and Inspection
Brake Pad and Rotor Burnishing
Brake Pad and Rotor Burnishing
Warning
Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure
to adhere to these precautions could lead to serious personal injury and vehicle damage.
Burnishing the brake pads and brake rotors is necessary in order to ensure that the braking surfaces are properly prepared after service has been
performed on the disc brake system.
This procedure should be performed whenever the disc brake rotors have been refinished or replaced, and/or whenever the disc brake pads have been
replaced.
1. Select a smooth road with little or no traffic.
2. Accelerate the vehicle to 48 km/h (30 mph).
Note
Use care to avoid overheating the brakes while performing this step.
3. Using moderate to firm pressure, apply the brakes to bring the vehicle to a stop. Do not allow the brakes to lock.
4. Repeat steps 2 and 3 until approximately 20 stops have been completed. Allow sufficient cooling periods between stops in order to properly
burnish the brake pads and rotors.
Brake Rotor Assembled Lateral Runout Correction
Brake Rotor Assembled Lateral Runout Correction
Note
*
Brake rotor thickness variation MUST be checked BEFORE checking for assembled lateral runout (LRO). Thickness variation exceeding the
maximum acceptable level can cause brake pulsation. Refer to Brake Rotor Thickness Variation Measurement (See: Brake Rotor Thickness
Variation Measurement) .
*
Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable specification can cause thickness variation to develop in the brake
rotor over time, usually between 4,800-11,300 km (3,000-7,000 mi). Refer to Brake Rotor Assembled Lateral Runout Measurement (See: Brake
Rotor Assembled Lateral Runout Measurement) .
Review the following acceptable methods for bringing the brake rotor assembled LRO to within specifications. Determine which method to use for the
specific vehicle being repaired.
*
The indexing method of correcting assembled LRO is most effective when the LRO specification is only exceeded by a relatively small amount:
0.025-0.127 mm (0.001-0.005 in). Indexing is used to achieve the best possible match of high spots to low spots between related components.
Refer to Brake Rotor Assembled Lateral Runout Correction - Indexing (See: Brake Rotor Assembled Lateral Runout Correction - Indexing) .
*
The on-vehicle brake lathe method is used to bring the LRO to within specifications through compensating for LRO while refinishing the brake
rotor. Refer to Brake Rotor Assembled Lateral Runout Correction - On Vehicle Lathe (See: Brake Rotor Assembled Lateral Runout Correction -
On Vehicle Lathe) .
If the assembled LRO cannot be corrected using these methods, then other components must be suspected as causing and/or contributing to the LRO
concern.
Brake Rotor Assembled Lateral Runout Correction - Indexing
Brake Rotor Assembled Lateral Runout Correction - Indexing
Special Tools
*
J-39544-KIT - Torque-Limiting Socket Set , or equivalent
*
J-45101-100 - Conical Brake Rotor Washers
