Regal L4-2.0L Turbo (2011)
Brake Rotor/Disc: Procedures
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 Refinishing
Brake Rotor Refinishing
Warning: Refer to Brake Dust Warning (See: Service Precautions/Technician Safety Information/Brake Dust Warning).
Note:
*
The disc brake rotors do not require refinishing as part of routine brake system service. New disc brake rotors do not require refinishing. Do not
refinish disc brake rotors in an attempt to correct the following conditions:
-
Brake system noise - squeal, growl, groan
-
Uneven and/or premature disc brake pad wear
-
Superficial or cosmetic corrosion/rust of the disc brake rotor friction surface
-
Scoring of the disc brake rotor friction surface less than the maximum allowable specification
*
Before refinishing a brake rotor, the rotor MUST first be checked for adequate thickness to allow the rotor to be refinished and remain above the
minimum allowable thickness after refinish specification. Refer to Brake Rotor Thickness Measurement (See: Testing and Inspection/Brake
Rotor Thickness Measurement). Disc brake rotors should only be refinished if they have adequate thickness to be refinished and if one or more of
the following conditions exist:
-
Thickness variation in excess of the maximum allowable specification
-
Excessive corrosion/rust and/or pitting
-
Cracks and/or heat spots
-
Excessive blueing discoloration
-
Scoring of the disc brake rotor surface in excess of the maximum allowable specification
*
Disc brake rotors may need to be refinished as part of the process for correcting brake rotor assembled lateral runout (LRO) that exceeds the
maximum allowable specification.
Note: Whenever the brake rotor has been separated from the hub/axle flange, clean any rust or contaminants from the hub/axle flange and the brake
rotor mating surfaces. Failure to do this may result in increased assembled LRO of the brake rotor, which could lead to brake pulsation.
1. Thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange.
2. Thoroughly clean any rust or corrosion from the mating surface and mounting surface of the brake rotor.
3. Inspect the mating surfaces of the hub/axle flange and the rotor to ensure that there are no foreign particles or debris remaining.
4. Mount the brake rotor to the brake lathe according to the lathe manufacturer's instructions, ensuring that all mounting attachments and adapters are
clean and free of debris.
5. Ensure that any vibration dampening attachments are securely in place.
6. With the brake lathe running, slowly bring in the cutting tools until they just contact the brake rotor friction surfaces.
7. Observe the witness mark on the brake rotor. If the witness mark extends approximately three-quarters or more of the way around the brake rotor
