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------------------------------------------------ You have pushed the trailer air supply valve. You should not move or back a tractor under a trailer until the whole air system is:

A. At normal pressure.
B. Between 60 and 80 psi.
C. Empty.

Answer :

Final answer:

The whole air system needs to be at normal pressure before moving or backing a tractor under a trailer.

Explanation:

The answer to the question is option A: At normal pressure. When you push the trailer air supply valve, it fills the air system of the truck and trailer with compressed air. This air system includes several components, such as air tanks, air lines, and brake chambers, which need to be pressurized to their normal pressure before moving or backing the tractor under a trailer.

Driving a truck or tractor under a trailer with an incomplete or empty air system can be dangerous as the brakes may not function properly. The brakes in a truck or trailer are operated by compressed air, and without sufficient air pressure, the brakes may not engage or release properly, leading to accidents or damage to the vehicle.

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