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Answer :
Final answer:
To test the trailer's air brakes during coupling, set the tractor protection valve control to the "emergency" position, then check for air pressure buildup and leaks.
Explanation:
When coupling a tractor-semitrailer, it is crucial to test the trailer's air brakes to ensure they are functioning correctly. To perform this test, you should place the tractor protection valve control in the "emergency" position. Once the valve is set, you can then build up air pressure in the system, apply the trailer brakes, and then listen for any air leaks. If there are leaks, this could indicate issues with the brake system which must be addressed before the vehicle is safely operable.
To further ensure the safety and proper function of the air brakes, the driver may also perform an applied pressure test, a static brake test, and a low-pressure warning signal test after the initial test.
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