During the inspection, what ports must air be released from to avoid rejection of the vehicle?

Releasing air from the exhaust port of the quick-release valve and the relay valve during an inspection is critical to ensure the vehicle meets safety standards. Quick-release valves are designed to vent air quickly to facilitate the operation of air brakes, while relay valves manage airflow in response to brake pedal input. Properly venting these ports allows inspectors to check for leaks and assess the functionality of the air brake system.

If any of these ports are not properly vented, it could indicate issues with the vehicle's air management system, potentially leading to performance failures during braking. Therefore, air must be released from these specific valves to avoid rejection of the vehicle.

Properly conducting this process is essential to ensure that the air brake system works effectively and safely, confirming that the vehicle is compliant with inspection requirements.