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Which requirement applies to a parking brake system?

  • A.It must act on all four wheels
  • B.It must be electrically operated, which ensures that it cannot be left applied when the vehicle is driven away
  • C.It must act independently of the service brake hydraulics
  • D.It must be capable of stopping the vehicle from its maximum speed within the distance prescribed for the service brake

Answer: C

The parking brake must hold the vehicle on a gradient using a means independent of the hydraulic circuit, so a hydraulic failure does not disable it. Its stopping performance requirement is far lower than the service brake's. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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