Practice question

When measuring an S-cam brake drum, the technician finds the diameter exceeds the maximum machine-to / discard limit cast on the drum. The correct action is to:

  1. Machine it anyway to clean up the surface
  2. Replace the drum because machining beyond the discard diameter weakens it and reduces heat capacity
  3. Install thicker linings to compensate
  4. Ignore it if there are no cracks

Answer: B — Replace the drum because machining beyond the discard diameter weakens it and reduces heat capacity

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