What is the proper procedure for performing a standing brake test?

The proper procedure for performing a standing brake test involves reducing the air pressure to a specific level, enabling a controlled application of power to check the effectiveness of the braking system. By reducing the straight air pressure to 30 psi when charged, the test allows the operator to assess how the brake responds under a calibrated condition—this is essential for understanding the brake's performance and ensuring safety during operation.

This method provides a systematic way to evaluate the brakes while also minimizing the risk of sudden engagement at higher pressures which could potentially cause excessive wear or malfunction. Additionally, applying one point of power ensures that the evaluation is conducted under typical operational scenarios, helping to identify any issues with the brake response.

The other options relate to different procedures that do not align with the standardized steps for a standing brake test. For instance, charging the air and applying brakes to a full stop may not provide meaningful insight into brake functionality under normal operating conditions. Observing pressure drops without engaging the brakes does not assess braking performance. Testing brakes at maximum speed could be unsafe and does not reflect the controlled environment needed for an accurate evaluation.