Q
30. Under normal conditions in order to engage the parking brakes the driver must first:
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ATurn off the engine.
BLet the air out of the spring brakes.
CBe sure air brakes system is fully pressurized.
Detailed Explanation
The correct answer is "Let the air out of the spring brakes.". This is based on federal CDL regulations and safety standards.
Correct Answer: Let the air out of the spring brakes.
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