What is the recommended action if the air tank shows excessive moisture?

Answer: B — Drain the tank regularly

The recommended action of draining the tank regularly is crucial for maintaining the air brake system's performance and safety. Excessive moisture in the air tank can lead to several issues, including corrosion, freezing in cold temperatures, and overall system inefficiency. Water in the air brake system can cause brake failure, as it can prevent the proper functioning of air components and contribute to more serious mechanical problems over time. By regularly draining the tank, any accumulated moisture can be removed, ensuring that the compressed air remains dry and free from contaminants. This practice not only extends the lifespan of the air brake system but also enhances its reliability, protecting both the vehicle and driver from potential hazards. Therefore, implementing a regular maintenance schedule, including draining the air tank, is essential for safe operation.