Q
83. You have pushed in the trailer supply valve. You should not move the tractor until the whole air system:
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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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