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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 333 (DISC BRAKES)SERVICINGBRAKE ROTOR REFINISHING
1999 GMC Forward Control 5.7 R, Automatic

Brake Rotor Refinishing

1999 GMC Forward Control 5.7 R, AutomaticSECTION Brake Rotor Refinishing
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Special Tools Required: Rotor/Drum Flange Resurfacing Kit (J-41013), Hub Cleaning Kit (J-42450-A) or equivalent.
  1. The disc brake rotors DO NOT require refinishing as part of routine brake system service. 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 surface.
    • Scoring of the disc brake rotor surface (less than the maximum allowable specification).
  2. Disc brake rotors should only be refinished if the following conditions exist:
    • 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).
    • Lateral runout in excess of the maximum allowable specification.
    • Thickness variation in excess of the maximum allowable specification.
  3. Inspect each of the disc brake rotors and determine if the rotors can be refinished and remain above the minimum allowable thickness after refinish specification:
    1. Inspect the thickness of each of the disc brake rotors. See DISC BRAKE SPECIFICATIONS  .
    2. Inspect each of the disc brake rotors for excessive surface wear and/or lateral runout. See DISC BRAKE SPECIFICATIONS  .
  4. If the rotors can be refinished, proceed with the rotor refinishing procedure.
    NOTE: Failure to clean the corrosion from the wheel bearing flange may result in increased lateral runout of the brake rotor and brake system pulsation.
  5. Use the rotor/drum flange resurfacing kit in order to thoroughly clean any corrosion from the wheel bearing flange.
  6. Use the hub cleaning kit in order to thoroughly clean any corrosion/rust from the brake rotor hub.
  7. Mount the brake rotor to the brake lathe according to the lathe manufacturer's instructions.
  8. Ensure that any vibration dampening attachments are securely in place.
  9. With the brake lathe running, slowly bring in the cutting tools until they just contact the brake rotor friction surfaces.
  10. 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 surface on each side, the brake rotor is properly mounted to the lathe.
  11. If the witness mark does not extend three-quarters or more of the way around the brake rotor, re-mount the rotor to the lathe.
  12. Following the brake lathe manufacturer's instructions, refinish the brake rotor.
  13. After each successive cut, inspect the brake rotor thickness. See DISC BRAKE SPECIFICATIONS  .
  14. If at any time the brake rotor exceeds the minimum allowable thickness after refinish specification, the brake rotor must be replaced.
  15. After refinishing the brake rotor, use the following procedure in order to obtain the desired non-directional finish:
    1. Follow the brake lathe manufacturer's recommended speed setting for applying a non-directional finish
    2. Using moderate pressure, apply the non-directional finish:
      • If the lathe is equipped with a non-directional finishing tool, apply the finish with 120 grit aluminum oxide sandpaper.
      • If the lathe is not equipped with a non-directional finishing tool, apply the finish with a sanding block and 150 grit aluminum oxide sandpaper.
    3. After applying a non-directional finish, clean each friction surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
  16. Remove the brake rotor from the brake lathe.
  17. Check brake rotor assembled Lateral Runout (LRO). See BRAKE ROTOR ASSEMBLED LATERAL RUNOUT (LRO) MEASUREMENT  under ADJUSTMENTS & INSPECTIONS.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.