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------------------------------------------------ The tractor protection valve is designed to close automatically if the air pressure falls into the pressure range specified by the manufacturer, typically:

A) 60-70 psi
B) 20-30 psi
C) 100-120 psi
D) 40-50 psi

A) 60-70 psi. The tractor protection valve usually closes automatically if air pressure falls into the range of 60-70 psi, to help maintain braking capability.

Explanation:

The tractor protection valve is a critical component in a truck's air brake system. It is designed to close automatically if the air pressure falls below a certain level, to preserve air for the tractor's brakes and thus prevent a complete loss of braking capability. The correct answer to the question is A) 60-70 psi. This is the typical pressure range at which manufacturers set the tractor protection valve to close. It is important to maintain proper air pressure in tires and braking systems as it ensures smooth, safe operation and can affect the vehicle's fuel efficiency and tire wear.