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The trailer air supply control (also called the tractor protection valve control) should automatically close when the air pressure falls to between ____ psi.

A. 60 and 85
B. 20 and 45
C. 100 and 125

Answer :

Final answer:

The trailer air supply control, also known as the tractor protection valve control, automatically closes when the air pressure falls to between 60 and 85 psi.

Explanation:

The trailer air supply control, also known as the tractor protection valve control, automatically closes when the air pressure falls to between 60 and 85 psi. This control valve protects the trailer brake system by closing off the air supply from the tractor when the pressure in the supply line drops. The specified range ensures that the air supply is cut off at a safe pressure level to avoid brake failure.

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