During the air brake test, what should you check after making a 10-psi brake pipe reduction?

After making a 10-psi brake pipe reduction during the air brake test, confirming that all independent brakes release is essential for ensuring the proper function and safety of the air braking system. When independent brakes release, it indicates that the air pressure is being correctly reflected throughout the brake system and that there are no leaks or failures in the individual brake mechanisms. This is crucial because any malfunction could lead to impaired braking performance, which can jeopardize safety.

Monitoring the independent brakes after the reduction verifies that the system is responding as expected to the changes in pressure. This step is integral to the overall integrity of the air brake system, ensuring reliability before proceeding with further operations or tests.