ACT Heavy Vehicle Knowledge Test Practice Questions - Heavy Vehicle Knowledge Test (Rigid Combination Road Rules Knowledge Test) Exam

What is the primary purpose of using engine braking (retarder or exhaust brake) when descending a long steep hill?

To increase vehicle speed on the descent To prevent the service brakes from overheating and experiencing brake fade To reduce fuel consumption on the downhill run To engage the diff lock for better traction

Correct Answer:

To prevent the service brakes from overheating and experiencing brake fade

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