Practice question

On a long descent, the driver of a combination uses only the service brake to decelerate. Does brake efficiency fall, and why?

  1. No. Service brakes cannot overheat on a combination
  2. Yes. The brake pads heat, and high temperature reduces their efficiency
  3. Yes, but only because the engine brake becomes more efficient
  4. No, provided the trailer is unladen

Answer: B — Yes. The brake pads heat, and high temperature reduces their efficiency

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