Q
87. The use of air brakes on a downgrade is only a supplement to the:
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AUse of the spring brakes.
BUse of the front brake limiting valve.
CBraking effect of the engine.
Detailed Explanation
The correct answer is "Braking effect of the engine.". This is based on federal CDL regulations and safety standards.
Correct Answer: Braking effect of the engine.
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