What can happen if the air compressor fails?

Answer: B — The air brake system will not build or maintain necessary pressure, leading to brake failure

The failure of the air compressor is critical to the operation of an air brake system because it is responsible for compressing air and supplying the necessary pressure for the brakes to function properly. If the air compressor fails, the air brake system will not be able to build or maintain the required air pressure. This lack of pressure can result in inadequate braking force, which can lead to brake failure. Without sufficient air pressure, the brakes cannot engage effectively, posing a significant safety hazard while driving. In this context, issues such as the system becoming overly pressurized or the brake lights malfunctioning are not direct consequences of a compressor failure. Additionally, an air brake system does not automatically switch to manual braking; it relies on air-powered mechanisms. Therefore, the most accurate answer revolves around the impact of insufficient pressure due to the compressor's failure, which ultimately jeopardizes the vehicle's braking capabilities.