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Answer :
Final answer:
Once you've finished your delivery and unhitched from your trailer, close the trailer supply valve to trap air in the truck’s braking system and prevent the release of the trailer's brakes.
Explanation:
When a Trailer Supply Valve, also known as the Tractor Protection Valve, is disconnected from a trailer, it must be closed to prevent air from escaping the braking system of the truck when disconnected. The Trailer Supply Valve controls the air pressure supply for the trailer's brake system. When you have finished your delivery and unhitched the trailer, close or 'pop-out' the valve. This means pushing the 'red' knob on your dash control valve unit. This action traps air in the truck's braking system and also prevents the accidental release of the trailer's brakes, if for example a supply-line failure occurred.
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