K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
(unsafe) and the new shoes/linings will be subject to overheating and brake fade.
How To Measure
NOTE: For additional information on how to use a drum micrometer see Fundamentals and Basics. See: Fundamentals and Basics
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A drum micrometer is used to measure the drum diameter.
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The micrometer scale should be initially set to the original (new) thickness of the drum.
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The base of the micrometer should be placed in the deepest groove in the drum and held steady while the measuring point is swiveled to find
the maximum diameter.
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The base and measuring point should be kept at the same depth in the drum.
Drum Micrometer
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The measurement should be repeated at 3 or more places around the circumference of the drum to determine if the drum is out of round. If the
measurements differ by more than 0.004 inches the drum should be resurfaced.
