Q
83. You have pushed in the trailer supply valve. You should not move the tractor until the whole air system:
Combination Vehiclesmedium
Aa. Empty.
Bb. At normal pressure.
Cc. Between 60 and 80 psi.
Detailed Explanation
The correct answer is "b. At normal pressure.". This is based on federal CDL regulations and safety standards.
Correct Answer: b. At normal pressure.
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