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Which brake type is essentially free of self servo action?

  • A.The two leading shoe drum brake, whose symmetrical arrangement cancels the self servo effect between the two shoes
  • B.The duo servo drum
  • C.The leading and trailing shoe drum, in which the trailing shoe cancels the self energising action of the leading one
  • D.The disc brake

Answer: D

A disc caliper clamps the disc symmetrically and generates no self energising force, which is why disc brakes need a servo but behave predictably. Leading and trailing designs still have net self servo from the leading shoe. Predictability is the disc's virtue. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming what changes and what stays the same is the reliable route through questions of this shape.

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