During the applied brake pressure test of the dual air brake system, what is the maximum leakage rate permitted?

• A. 2 psi per minute
• B. 3 psi per minute
• C. 4 psi per minute
• D. 5 psi per minute

Answer: (B)

In the context of a dual air brake system, a maximum leakage rate of 3 psi per minute is permissible during the applied brake pressure test. This standard is crucial because it helps ensure the reliability and effectiveness of the braking system. If the leakage rate exceeds this limit, it can indicate potential issues within the system, such as leaks in the brake lines or components that could compromise the safety of the vehicle and its passengers. Maintaining the leak rate at or below 3 psi per minute helps to ensure that the brakes can engage appropriately and that the vehicle can stop safely under various operating conditions. Understanding these parameters is vital for ensuring compliance with safety regulations and for performing effective vehicle inspections.