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After pushing in the trailer supply valve, you should not move the tractor until the air system is:

A) Fully depressurized
B) Under high pressure
C) At minimal pressure
D) At normal pressure

Answer :

Final answer:

After pushing in the trailer supply valve, you should not move the tractor until the air system is fully depressurized.

Explanation:

After pushing in the trailer supply valve, you should not move the tractor until the air system is fully depressurized. This means that all the air has been released from the system, ensuring that there is no residual pressure that could cause the trailer to move unexpectedly.

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