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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1365 (Disc Brake System) >> Repair Instructions >> Brake Rotor Assembled Lateral Runout (LRO) Correction - On-Vehicle Lathe >> Adjustment Procedure

Adjustment Procedure

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Brake rotor thickness variation greater than the specification can cause brake pulsation.
  1. Measure the brake rotor thickness variation. Refer to Brake Rotor Thickness Variation Measurement .
    2. IMPORTANT: Brake rotor assembled lateral runout (LRO) greater than the specification can cause brake pulsation.
  2. Measure the brake rotor LRO. Refer to Brake Rotor Assembled Lateral Runout (LRO) Measurement .
    3. Fig 1: Installing All J 45101-100s & Lug Nuts
    GM891801Courtesy of GENERAL MOTORS CORP.
  3. Remove the J 45101-100  and the wheel nuts. See Special Tools and Equipment .
  4. Remove the rotor from the hub.
  5. Inspect the mounting surface of the hub and the brake rotor. Verify the surfaces are clean.
  6. Verify the caliper is hanging in a position away from any rotating components, such as the rotor and the lathe.
  7. Follow the lathe manufacturer's instructions in order to install the lathe.
  8. Follow the lathe manufacturer's instructions in order to refinish the brake rotor.
  9. Measure the thickness of the rotor. Refer to Brake Rotor Thickness Measurement .
  10. If the thickness is less than the specification, replace the brake rotor.
  11. If the thickness is greater than the specification, complete the following steps:
    1. Use the correct lathe speed setting in order to apply a non-directional finish.
    2. If the lathe has a non-directional finishing tool, use 120 grit aluminum oxide sandpaper in order to apply a non-directional finish.
    3. If the lathe does not have a non-directional finishing tool, use a sanding block and 150 grit aluminum oxide sandpaper in order to apply a non-directional finish.
  12. Remove the lathe from the vehicle.
  13. Clean both sides of the rotor with denatured alcohol, or an equivalent approved brake cleaner.
  14. Measure the brake rotor LRO. Refer to Brake Rotor Assembled Lateral Runout (LRO) Measurement .
  15. If the brake rotor LRO is greater than the specification, refer to Brake Rotor Assembled Lateral Runout (LRO) Correction .
  16. If the brake rotor LRO is less than the specification, install the brake caliper.
  17. Press the brake pedal several times in order to position the brake rotor.
  18. Remove the wheel nuts.
  19. Remove the J 45101-100  . See Special Tools and Equipment .
  20. Install the tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
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