What is an air brake check?

An air brake check is a critical procedure to ensure that the air brake system in a commercial vehicle is functioning correctly before operating the vehicle. This involves several steps, including checking for air leaks, verifying that the air pressure builds up to the appropriate level, and confirming that the brakes respond as expected when applied. Proper functionality of the air brake system is crucial for safety, as it directly affects the vehicle's ability to stop effectively and safely in various driving conditions. Ensuring that the air brakes are operational before driving helps prevent potential accidents caused by brake failure.

Other options do not pertain to the functionality of the air brake system. Checking tire pressure is important for vehicle safety and performance but is unrelated to air brakes. Testing a driver's reflexes does not directly assess the vehicle's braking system and checking engine oil levels pertains to engine maintenance rather than braking performance.