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Wheel Bearings Diagnosis (Tapered): Etching

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Etching Pattern
G02501585Courtesy of GENERAL MOTORS CORP.

The bearing surfaces appear gray or grayish black in color, with related etching away of material usually at roller spacing.

  1. Check the seals.
  2. Check for proper lubrication.
  3. Clean all of the parts and the housings.
  4. Replace the bearings. Refer to WHEEL HUB, BEARING & SEAL REPLACEMENT (AWD) or WHEEL HUB, BEARING & SEAL REPLACEMENT (RWD) .
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