When performing a brake test, you must be sure that:

When performing a brake test, you must be sure that:

• A. All brakes release.
• B. Both sides of the car are examined during the inspection process to observe the functioning of all moving parts of the brake system.
• C. The brakes release and the system is leak-free.
• D. The brake pipe pressure is raised to the service level

Answer: (A)

The main idea being tested is confirming that every brake releases when you perform the brake test. If any brake sticks and remains applied after you release, it will drag, overheat, and can lead to unsafe conditions or brake system damage. That direct check—verifying that all brakes release—is why this option is the best. While other steps like inspecting both sides of a car, checking for leaks, or increasing brake pipe pressure to service level are important parts of broader brake testing or inspection, they do not address the essential outcome of this particular test: that no brake remains applied after release. Ensuring all brakes release gives you confidence there’s no brake drag and the system can release properly under normal operation.

The main idea being tested is confirming that every brake releases when you perform the brake test. If any brake sticks and remains applied after you release, it will drag, overheat, and can lead to unsafe conditions or brake system damage. That direct check—verifying that all brakes release—is why this option is the best.

While other steps like inspecting both sides of a car, checking for leaks, or increasing brake pipe pressure to service level are important parts of broader brake testing or inspection, they do not address the essential outcome of this particular test: that no brake remains applied after release. Ensuring all brakes release gives you confidence there’s no brake drag and the system can release properly under normal operation.