Louisiana Class D Chauffeur's License Practice Test

What must be assessed regarding the air compressor during an air brake check?

1. engine temperature

2. brake pressure levels

3. air compressor governor cut-in and cut-out pressures

4. fuel efficiency

The correct answer is: air compressor governor cut-in and cut-out pressures

The proper assessment of the air compressor during an air brake check is crucial for ensuring that the braking system functions effectively and safely. Monitoring the air compressor governor cut-in and cut-out pressures is essential because these pressures determine how the air compressor operates within the brake system. The cut-in pressure is the point at which the air compressor starts to build air pressure when it drops below a preset level, while the cut-out pressure is when the compressor stops running after reaching the maximum pressure. If these pressures are outside of the manufacturer's specifications, it can indicate that the air compressor is not functioning correctly, potentially leading to inadequate air pressure for the brakes, which can impair braking performance. In contrast, assessing engine temperature, brake pressure levels, and fuel efficiency does not provide direct insight into the operational reliability of the air compressor in relation to braking. Ensuring that the air compressor governor operates within the correct cut-in and cut-out pressures directly contributes to the safety and performance of the air brake system.