Vehicle Controls
What is the purpose of a retarder or engine brake on a heavy vehicle?
South African learner's licence practice question. Difficulty: hard.
Answer: A retarder slows the vehicle without the service brakes, keeping them cool and effective on long descents.
- A. To increase engine power
- B. To help slow the vehicle without using the service brakes, especially on long descents - correct
- C. To lock the differential
- D. To warm the engine
Explanation
A retarder slows the vehicle without the service brakes, keeping them cool and effective on long descents.
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