What is the correct order of steps for a pre-trip air brake inspection?

The sequence provided in the correct answer begins with securing the vehicle by chocking the wheels, which is essential for safety during the inspection process. Once the wheels are secured, the inspection flows logically through critical components of the air brake system.

Next, checking the tractor protection system is important as it ensures that the brake system will function properly when the trailer is attached. Following this, examining the park control valve helps confirm that the parking brakes will engage correctly, preventing movement when parked.

The supply circuit is assessed to ensure that air pressure is adequate for the brake system to function. After verifying these systems, checking for air system leaks is essential to ensure that the air brakes maintain sufficient pressure without any loss during operation.

Finally, concluding with the service brake response allows the driver to test how effectively the service brakes operate, ensuring that the vehicle can be stopped safely. This systematic approach covers all vital components before evaluating the functionality of the brakes, which is crucial for safe operation.

This methodical process helps ensure the reliability and safety of the air brake system, reflecting best practices in pre-trip inspections.