Georgia Commercial Driver License Practice Test

During an applied leakage test, what is the maximum leakage rate allowed for a triple combination vehicle?

1. 4 psi in a minute

2. 6 psi in a minute

3. 8 psi in a minute

4. 10 psi in a minute

The correct answer is: 6 psi in a minute

The maximum leakage rate allowed for a triple combination vehicle during an applied leakage test is indeed 6 psi in a minute. This standard is based on the need to ensure that air brake systems maintain adequate pressure to function properly and safely. An acceptable leakage rate is crucial because excessive leakage may indicate problems within the brake system, potentially leading to brake failure or reduced braking efficiency. In the context of triple combination vehicles, which often consist of a power unit and two trailers, maintaining a low leakage rate is particularly important. Due to the complexity and size of these vehicles, they rely on a well-maintained air system for safe operation, and adhering to the established 6 psi per minute maximum ensures that the braking system remains effective under various driving conditions. Understanding this standard helps drivers and vehicle operators ensure their vehicles are in compliance with safety regulations and operational efficiency requirements mandated for commercial driving.