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Brake Rotor Refinishing

  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: 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: See ROTOR THICKNESS MEASUREMENT  under ADJUSTMENTS & INSPECTIONS. Inspect each of the disc brake rotors for excessive surface wear and/or lateral runout. See SURFACE AND WEAR INSPECTION  under ADJUSTMENTS & INSPECTIONS.
  4. If the rotors can be refinished, proceed with the rotor refinishing procedure.
  5. If necessary, use the Rotor/Drum Flange Resurfacing Hit (J-41013) in order to thoroughly clean any corrosion from the wheel bearing flange.
  6. If necessary, use the Hub Cleaning Kit (J-42450-A) 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 ROTOR THICKNESS MEASUREMENT  under ADJUSTMENTS & INSPECTIONS.
  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.
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