How do you test the trailer emergency brakes?

To effectively test the trailer emergency brakes, the correct method involves checking if the trailer rolls freely and pulling the air supply control. This process is essential because it ensures that the emergency brakes are functioning properly before you begin your journey.

When you check if the trailer rolls freely, it helps confirm that the brakes are not unintentionally engaged. After ensuring that the trailer is not rolling, pulling the air supply control activates the trailer's emergency braking system. This action allows you to observe the brakes' engagement and ensures they are responsive and effective in case of an emergency.

Other methods, such as driving forward to see if the brakes engage or applying the parking brake to check for slippage, may not provide a reliable assessment of the emergency brake system. Similarly, just listening for sounds while rolling down a hill does not give you accurate feedback on the braking system's functionality. The selected approach is comprehensive and adheres to safety protocols, ensuring proper operation of the trailer's emergency brakes.