What is the maximum acceptable leakage rate for single vehicles in one minute?

The maximum acceptable leakage rate for single vehicles in one minute is 2 psi. This standard is important for ensuring that the vehicle's air brake system is functioning properly. A leakage rate higher than this threshold could indicate issues such as air leaks in the system, which could compromise the effectiveness of the brakes and pose a safety risk while driving.

Maintaining the leakage rate at or below 2 psi ensures that the air supply remains adequate for braking power, allowing the driver to stop safely and effectively. Regularly checking for leaks is a crucial part of vehicle maintenance and safety protocols in the trucking industry, aligning with best practices outlined in state and federal regulations.

The other options do not meet the safety standards for leakage rates, as they either permit a higher amount of air loss than is considered safe or do not align with established practices for air brake systems in vehicles.