Answer :
Final answer:
To test trailer air brakes when coupling a tractor-semitrailer, the Tractor Protection Valve Control should be set to the Normal position, allowing for proper pressurization and brake functionality testing.
Explanation:
When coupling a tractor-semitrailer, in order to test the trailer air brakes, you should place the tractor protection valve control in the Normal position. This is the correct position for driving and allows for the air system to charge and for the brakes to be tested. It's critical that drivers ensure the air brake system is fully pressurized and that the trailer brakes are functioning properly before beginning to drive.
When coupling a tractor-semitrailer to test the trailer air brakes, you should place the tractor protection valve control in the Emergency position.
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