What happens when the air compressor fails?

When the air compressor fails, the air brake system can lose pressure, which directly affects the braking ability of the vehicle. The air brake system relies on compressed air to function properly. Without sufficient air pressure generated by the compressor, the brake chambers cannot operate effectively, leading to a potential loss of braking power. This can result in longer stopping distances or even the inability to stop the vehicle safely.

In contrast, some of the other possibilities, such as the vehicle being immobile or the brakes automatically locking up, are not typical outcomes of an air compressor failure. Moreover, fuel efficiency would not improve as a result of this failure; in fact, operating a vehicle that doesn't have effective braking could pose significant safety hazards, which could actually lead to increased fuel consumption due to unsafe driving practices. Thus, the correct statement accurately reflects the serious implications of a failing air compressor on brake functionality.