What is the maximum allowable air loss in one minute during a static test for vehicles with air brakes?

The correct answer reflects the standard requirement for static air loss tests in vehicles equipped with air brakes. During this test, a well-functioning air brake system should not lose more than 2 psi of air pressure in one minute. This criterion is critical because excessive air loss can indicate potential leaks or malfunctioning components within the brake system, which could lead to reduced braking efficiency or failures.

Maintaining the air pressure within this limit ensures that the vehicle will reliably engage its brakes when needed, promoting safety on the road. Additionally, adhering to these specifications is part of the overall pre-trip inspection process to ensure the vehicle is in good working order before operating it. Proper knowledge of these requirements is essential for any commercial driver's license (CDL) holder, reinforcing the importance of regular vehicle maintenance and safety compliance.