Air Brake Practice Test

What is the maximum leakage rate?

1. More than 2 psi in one minute

2. More than 2 psi in two minutes

3. More than 3 psi in one minute

4. More than 3 psi in two minutes

The correct answer is: More than 3 psi in one minute

The maximum leakage rate is defined as the allowable loss of air pressure in the brake system over a specific time frame. A leakage rate of more than 3 psi in one minute exceeds the maximum acceptable standard for air brake systems. This benchmark is critical to ensure the reliability and safety of the air braking mechanism in commercial vehicles. Maintaining a leakage rate below this threshold is essential for the effectiveness of the brakes. If the leakage rate is too high, it could indicate leaks in the air brake system, which would compromise braking performance and safety. Therefore, the correct answer emphasizes that a leakage rate above 3 psi in one minute signifies a potential issue that needs to be addressed to ensure safe vehicle operation.