Arizona Air Brakes CDL Practice Test

What does the air compressor governor control?

1. When air is pumped into the air tanks.

2. Air pressure applied to the brakes.

3. The speed of the air compressor.

4. When the brake chambers release pressure.

The correct answer is: When air is pumped into the air tanks.

The air compressor governor plays a critical role in the air brake system by controlling when air is pumped into the air tanks. It monitors the pressure levels within the system and activates the compressor when the air pressure drops below a certain threshold, ensuring that the air tanks are adequately filled to provide the necessary pressure for the brakes to function effectively. This automatic operation helps maintain the efficiency and responsiveness of the braking system, contributing to overall vehicle safety. The other options pertain to different functions within the braking system. The application of air pressure to the brakes is managed by the vehicle's braking mechanism itself, while the speed of the air compressor is influenced by the engine's performance rather than directly controlled by the governor. The release of pressure in the brake chambers involves the braking system's design and operation but is not the primary function of the air compressor governor. Understanding the governor's specific role helps clarify how the air brake system maintains proper pressure for safe vehicle operation.