Air Brake Practice Test

What controls the air pressure as the air compressor pumps air into the storage tanks?

1. Air pressure gauge

2. Air pressure regulator

3. Spring actuator

4. Brake controller

The correct answer is: Air pressure regulator

The air pressure regulator is responsible for controlling the air pressure as the air compressor pumps air into the storage tanks. Its primary function is to maintain the desired pressure level within the air system, ensuring that the air compressor does not overfill the storage tanks or cause excessive pressure buildup. By adjusting the flow of air based on the system's requirements, the air pressure regulator ensures consistent and reliable performance of the air brake system. In this context, the air pressure gauge would only display the current pressure level rather than regulate it. A spring actuator is generally involved in mechanical systems, often related to the activation of the brakes, but does not directly control the air pressure in the system. Similarly, a brake controller manages the braking action but does not regulate the air pressure—its role is more about the application and release of brakes based on driver input. Thus, the air pressure regulator plays a crucial role in the overall function and safety of the air brake system.