What is a common sign indicating an issue with an air brake compressor?

Answer: B — Slow build-up of air pressure

A slow build-up of air pressure is a significant indicator of an issue with an air brake compressor. In a properly functioning air brake system, the compressor should generate air pressure quickly, allowing the system to reach the required pressure levels without undue delay. When there’s a slowdown in the air pressure build-up, this could signal a problem with the compressor itself, such as wear or malfunction, which could lead to insufficient braking power. The presence of slow pressure build-up can also cause operational issues, as the air tanks may not charge quickly enough to maintain the brake system’s effectiveness. Drivers should be alert for this sign, as it may necessitate maintenance or inspection of the air brake compressor to ensure safety and reliability while driving.