F 250 4WD Pickup V8-7.3L DSL Turbo VIN K (1994)
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.
NOTE: A drum which is out of round will cause a pedal pulsation to be felt upon braking.
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The measurement should also be repeated at various depths of the drum to check for a bellmouth condition. If the measurements differ by more
than .010 inches the drum should be resurfaced.
For additional information on how to use a drum micrometer see Fundamentals and Basics.
