Georgia Commercial Driver License Practice Test

Which of the following components is not part of an air brake system?

1. Brake chambers

2. Air compressor

3. Axle brake system

4. Pressure gauge

The correct answer is: Axle brake system

An air brake system consists of various components that work together to ensure effective braking in commercial vehicles. The brake chambers, air compressor, and pressure gauge are all integral parts of this system. The brake chambers are crucial as they convert compressed air into mechanical force, which then applies the brakes. The air compressor is vital for generating and maintaining the air pressure required for the brake system to function. The pressure gauge is important for the driver to monitor the air pressure in the system, ensuring it remains within safe operating limits to prevent brake failure. On the other hand, the axle brake system is not a specific part of the air brake system but rather a general term that may refer to the braking components that act specifically on the axle. In the context of air brakes, while there may be brakes at the axle level, they do not constitute a distinct component of the air brake system. Therefore, identifying the axle brake system as not part of the air brake system is correct, as it does not represent a specific air brake component necessary for its operation.