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

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

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

Correct Answer:

To assist the service brakes on descents and reduce brake wear and fade

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