Practice question

What is the main purpose of a retarder or exhaust brake fitted to a heavy vehicle?

  1. To increase the vehicle's maximum road speed
  2. To improve fuel economy when climbing hills
  3. To replace the parking brake when stationary
  4. To assist the service brakes on descents and reduce brake wear and fade

Answer: D — To assist the service brakes on descents and reduce brake wear and fade

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Practice more: DRTS Heavy-Vehicle Theory Practice Questions - Botswana DRTS Heavy-Vehicle Driving Theory Test (Classes C, C1, EB, EC, EC1) Exam →