During the last one minute wait for the "Brake Pipe Leakage Test," what is the maximum allowed leakage?

Answer: C — 5 PSI

The maximum allowed leakage during the "Brake Pipe Leakage Test" is 5 PSI. This standard reflects the operational safety requirements when testing freight car braking systems. If the leakage exceeds this threshold, it indicates that there might be a problem with the air brake system, such as a leak in the brake pipe or associated components. Keeping leakage to a minimum is crucial for ensuring that the braking system can maintain proper pressure and function effectively in emergency situations. A limit of 5 PSI ensures that the system will operate reliably under dynamic conditions, minimizing the risk of brake failure or inadequacies during operation.