What maximum air leakage rate is acceptable when the brakes are applied during a test?

The maximum air leakage rate of 2 PSI per minute is the acceptable standard when testing brakes. This standard is established to ensure that braking systems maintain a sufficient level of air pressure and function properly, which is critical for the safety of vehicles, particularly those that operate in heavy traffic or under demanding conditions.

An acceptable air leakage rate ensures the effectiveness of the braking system over time, making it less likely for drivers to experience brake failure or diminished stopping power while on the road. Maintaining a leakage rate at or below 2 PSI per minute indicates that the braking system is operating efficiently and can deliver reliable performance. This standard applies to commercial vehicles, where brake integrity is paramount to ensuring the safety of both the driver and other road users.

In comparison, lower or higher rates would indicate potential issues with the braking system; too low may flag underperformance, while higher rates could suggest leaks or maintenance issues that could compromise safety. Thus, 2 PSI per minute serves as a balanced benchmark for indicating a healthy air braking system.