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To test the trailer emergency brakes, you should charge the air brake system, check that the trailer rolls freely, and then:

1) Apply the trailer emergency brakes
2) Disconnect the trailer from the truck
3) Check the trailer lights
4) Inspect the trailer tires

Answer :

Final answer:

To test the trailer emergency brakes, you should charge the air brake system, check that the trailer rolls freely, and apply the trailer emergency brakes. This process ensures the emergency brakes are functioning correctly for safety.

Explanation:

To test the trailer emergency brakes, you should charge the air brake system, check that the trailer rolls freely, and then apply the trailer emergency brakes. This process involves ensuring the air brake system is fully pressurized and then engaging the emergency brake mechanism to verify that it can effectively stop the trailer. This is a critical safety check to ensure that the trailer can be stopped suddenly in case of an emergency. While other maintenance checks like inspecting the trailer tires and checking the trailer lights are important for overall vehicle safety and operation, they do not directly test the functionality of the emergency brakes.

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