What is the maximum allowable pressure loss with brakes released during the air pressure leakage test for a single vehicle?

The correct answer is 2 p.s.i. as the maximum allowable pressure loss with brakes released during the air pressure leakage test for a single vehicle. This standard is established to ensure that the vehicle's braking system remains efficient and safe. A pressure loss greater than this threshold could indicate potential leaks or issues within the air brake system, which may compromise the vehicle’s braking performance. Regular testing ensures that any abnormalities are identified early, promoting vehicle safety on the road.

In practice, if the pressure loss were to exceed this limit, it might signal a problem that requires immediate attention, ensuring that the vehicle remains compliant with safety regulations. Keeping the leakage within the specified limit helps in maintaining the overall integrity and reliability of the air brake system.