In checking the system air-loss rate, what pressure drop indicates a passing result?

A pressure drop of equal to or less than 3 psi indicates a passing result when checking the system air-loss rate. This standard is important as it reflects the integrity of the air system within the vehicle. If the pressure loss is minimal, it suggests that there are no significant leaks or issues within the air system, which is crucial for the safe operation of the vehicle during both driving and when braking.

In the context of safety inspections, maintaining pressure within acceptable limits is necessary to ensure the vehicle's air brake system is functioning properly. A drop above this threshold may indicate potential problems that could compromise the brake system's performance, increasing the risk of failure during operation. Therefore, a maximum drop of 3 psi is a critical benchmark for passing the inspection, ensuring the vehicle is safe for use on the road.