Which of the following describes the correct use of emergency brakes for trailers with no spring brakes?

Using emergency brakes correctly for trailers without spring brakes is essential for ensuring safety during a malfunction or when an emergency arises. When you connect the emergency line and charge the air tank before disconnecting the trailer, you ensure that the air brakes are operational and can provide a safe stopping mechanism in case of a failure in the primary braking system.

By charging the air tank, you allow for sufficient pressure to operate the brakes effectively. This action prepares the system to function correctly, reducing the risk of brake failure when the trailer is in motion. It emphasizes the importance of having an operational braking mechanism, which is critical for safe driving, especially in multi-trailer configurations.

In contrast, using hydraulic brakes is not appropriate because many trailer braking systems operate on air brakes; the terminology and function of emergency brake systems differ in this context. Manually pulling the emergency brake lever without ensuring the system is charged can lead to brake failure, and leaving the emergency brakes unused is not a viable practice, as it neglects a critical safety feature designed to be engaged if necessary.