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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1601 (Vibration Symptoms Diagnosis And Correction) >> Diagnostic Information and Procedures >> Brake Rotor/Drum Balance Inspection

Brake Rotor/Drum Balance Inspection

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Support the vehicle drive axle(s) on a suitable hoist. Refer to JACKING AND LIFTING .
  2. Remove the tire and wheel assemblies from the drive axle(s). Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION .
    CAUTION: Refer to WORK STALL TEST CAUTION .
  3. Reinstall the wheel nuts in order to retain the brake rotors.
  4. Run the vehicle at the concern speed while inspecting for the presence of the vibration.
    NOTE: Do not depress the brake pedal with the brake rotors and/or the brake drums removed, or with the brake calipers repositioned away from the brake rotors, or damage to the brake system may result.
  5. If the vibration is still present, remove the brake rotors from the drive axle(s), then run the vehicle back to the concern speed. Refer to BRAKE ROTOR .
  6. If the vibration is eliminated when the brake rotors are removed from the drive axle(s), repeat the test with one rotor installed at a time. Replace the rotor that is causing or contributing to the vibration concern. Refer to BRAKE ROTOR .
    Fig 1: Inspecting Brake Rotor/Drum Balance
    G02708536Courtesy of GENERAL MOTORS CORP.
  7. If a brake rotor was replaced as a result of following the previous steps, or if necessary to confirm the results obtained during the previous steps, and/or to check the non-drive axle components, perform the following:
    1. 7.1. Mount the brake rotor on a balancer in the same manner as a tire and wheel assembly.
      IMPORTANT: Check brake rotors for static imbalance only; ignore the dynamic imbalance readings.
    2. 7.2. Inspect the rotor for static imbalance.

There is not a set tolerance for brake rotor static imbalance. (However, any brake rotor measured in this same manner which is over 21 g [3/4 oz] may have the potential to cause or contribute to a vibration.) Rotors suspected of causing or contributing to a vibration should be replaced. Any rotor that is replaced should be checked for imbalance in the same manner.

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