What is the purpose of the air compressor in an air brake system?

Answer: B — To build and maintain air pressure

The air compressor in an air brake system plays a crucial role in building and maintaining necessary air pressure. This pressure is essential for the operation of the brakes, as air brakes rely on compressed air to actuate the braking mechanism. When the driver applies the brakes, the system uses this compressed air to engage the brakes effectively, providing the necessary force to slow down or stop the vehicle. Maintaining the correct air pressure is vital; if the pressure is too low, the brakes may not engage properly, leading to reduced braking effectiveness and potential safety hazards. The compressor continues to operate to ensure that air is available for not only braking but also for other functions such as releasing the brakes when the driver releases the pedal. Thus, understanding the function of the air compressor helps prioritize its role in ensuring a safe and effective air brake system.