It's essentially a visual inspection. When you inspect the bearings, they should still have much of the original hone/grind finish marks on the running surface. They should be discarded if you find any of the following:
- cracks
- spalls
- chatter marks
- excessive nicks or dent marks
- discoloration (beyond very faint straw color)
- corrosion
- gray matte finish
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95 E320 Cabriolet, 169K
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