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Which brake type uses engine compression to retard a vehicle?

  • A.The service brake
  • B.The endurance brake, which is a general term covering every device used to control the speed on a long descent
  • C.The exhaust brake or engine compression brake
  • D.The retarder, which is a hydraulic or electromagnetic device mounted within the transmission of the vehicle

Answer: C

An exhaust brake throttles the exhaust while a compression release brake opens the valves near top dead centre, both absorbing power. Retarders are separate devices, and endurance brake is the general term covering all of them, so the last option is broadly right rather than wrong. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist.

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