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Which disc feature is measured at inspection?

  • A.Diameter and the number of ventilation vanes, which determine the cooling capacity available for the vehicle
  • B.Surface hardness
  • C.The depth of the wear lip at the outer edge, which indicates the amount of material that has been removed in service
  • D.Thickness and lateral runout

Answer: D

Discs are measured against a minimum thickness stamped on the hub and checked for runout with a dial gauge. A wear lip is an indication but not the measurement. Excessive runout produces pedal pulsation. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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