CDL Class A Practice Test 2025 – The Complete All-in-One Guide to Passing Your Exam!

The correct answer indicates that the low air pressure warning signal should activate before the pressure drops below 60 psi. This is an important safety feature in air brake systems for commercial vehicles, including those that require a CDL Class A license.

The activation of the warning signal at this specific pressure level is designed to provide the driver with ample time to respond before the situation becomes critical. Air brake systems rely on maintaining adequate pressure to function properly. If the pressure drops below this threshold, it can compromise braking performance, leading to dangerous situations on the road.

The warning signal being set to activate before the pressure drops below 60 psi is a regulatory requirement and is standard practice. It ensures that drivers are alerted to the decreasing air pressure situation and can take the necessary steps to remedy the situation, such as pulling over and checking for potential air leaks or other issues within the braking system. This proactive alert allows for better decision-making and enhances overall safety.