Brake Rotor Refinishing

DO NOT refinish the brake rotors in order to correct any of the following conditions:

• Brake noise, such as a growl or squeal.
• Premature brake lining wear.
• Superficial corrosion of the rotor braking surface.
• Rotor discoloration.

Refinish the brake rotors ONLY when one or more of the following conditions exist:

• Severe scoring of the rotor braking surface, the groove depth in excess of specification.
• Brake pulsation that is caused by the following conditions:
  1. Lateral runout in excess of specification.
  2. Brake rotor thickness variation in excess of specification.
  3. Corrosion or pitting that is deeper than the rotor braking surface.

Use the Hub Cleaning Kit (J-42450-A) in order to clean the wheel bearing and the wheel bearing hub. Use a micrometer in order to measure the thinnest point of the brake rotor. If the thinnest point of the brake rotor exceeds the brake rotor minimum thickness, DO NOT refinish the brake rotor. Replace the brake rotor. See DISC BRAKE ROTOR  under REMOVAL & INSTALLATION. Use the Rotor Resurfacing Kit (J-41013) or an equivalent tool in order to thoroughly clean the rust from the brake rotor flange. Refinish the brake rotor. Refer to the brake lathe manufacturer's operating instructions. After machining the rotor, use 120-grit aluminum oxide sandpaper and, if available, a non-directional rotor finisher in order to create a non-directional braking surface. Clean the braking surfaces with GM(R) Brake Cleaner (12377981), or with an equivalent brake parts cleaner.