What is the acceptable static leakage test limit for single vehicles?

The acceptable static leakage test limit for single vehicles is established to ensure that the vehicle's braking system can effectively hold pressure and maintain functionality. A limit of -2 psi indicates that, during a static leakage test, the vehicle’s air pressure can decrease by no more than 2 psi over a specific period. This standard is crucial for ensuring the safety and reliability of the braking system, as excessive leakage can compromise braking performance, leading to unsafe driving conditions.

This standard is typically defined by regulations and industry practices, which aim to maintain high safety standards in vehicle operation, particularly in emergency response scenarios like those faced by fire services. By adhering to this limit, operators can be confident that the vehicle's braking system is functioning within safe parameters, thus enhancing operational safety during fire responses.