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

User YwH
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1 Answer

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Final answer:

The trailer air supply control, or Tractor Protection Valve (TPV) control, should automatically close when the air pressure falls to between 20 psi and 45 psi.

Step-by-step explanation:

The trailer air supply control, also known as the Tractor Protection Valve (TPV) control, is an important component of a truck's air brake system. It is designed to automatically close when the air pressure falls to between 20 psi and 45 psi.

User Bbodien
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