New Jersey Air Brakes Practice Exam

What should occur before uncoupling a trailer with air brakes?

Establish air supply Depressurize the system Leave the system pressurized Perform a system check

Correct Answer:

Depressurize the system

Explanation:

Before uncoupling a trailer with air brakes, it is essential to depressurize the system. This procedure is critical because leaving the system pressurized could lead to unintended deployment of the trailer brakes once the connection is broken, creating a potential hazard. Depressurizing the air brake system ensures that all air pressure is released, which allows for a safe disconnection of the trailer without the risk of the brakes engaging unexpectedly. In typical practice, depressurization is done by venting the air from the system, ensuring that the trailer's emergency brakes won't activate when the tractor and trailer are uncoupled. This is a crucial step in maintaining safety and preventing accidents during the uncoupling process.

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