What step is needed after coupling air hoses during a brake test?

After coupling air hoses during a brake test, the next crucial step is to open the angle cocks. This action allows the air to flow into the brake pipe, enabling the air brake system to charge properly. Opening the angle cocks is essential for ensuring that the brakes are ready for the functionality tests that follow. Without this step, the air would be trapped, and the brake system would not achieve the necessary pressure to carry out further procedures like applying the brakes or conducting a leak test. Having the angle cocks open allows for the necessary communication and operation of the air brake system, which is vital for safe operations.

While charging the brake pipe, applying the brakes, or inspecting for binding are all important parts of the brake testing process, they should occur after the initial step of opening the angle cocks to ensure proper air flow and brake readiness.