How much air pressure loss is acceptable in a system leak test during a full service brake application?

In the context of a system leak test during a full service brake application, a loss of 2 psi is considered acceptable for maintaining the efficiency and safety of the brake system. This standard is based on ensuring that the braking system retains enough air pressure to function effectively and respond timely when brakes are applied.

A loss greater than this threshold could indicate potential issues within the braking system, such as leaks or other malfunctions that could compromise braking performance. It’s crucial for vehicle operators and maintenance personnel to routinely check the air pressure loss during these tests to ensure the braking system remains in good working order, thereby ensuring safety for the operator and others on the road.

In addition, understanding acceptable limits helps in setting appropriate maintenance schedules and assessing if repairs are necessary before a vehicle is deemed roadworthy.