When should the air tanks of an air brake system be drained?

Regularly draining the air tanks in an air brake system is essential for maintaining the system's effectiveness and safety. Over time, moisture from the air can accumulate in the air tanks due to temperature changes and the natural process of condensation. This moisture can lead to several issues, including rust, corrosion, and even the freezing of air lines in cold weather, which can interfere with the brake system's functionality.

By regularly draining the air tanks, you help ensure that any accumulated moisture is removed, thus maintaining the integrity and performance of the air brake system. This practice contributes to the overall maintenance of the vehicle, reducing the risk of brake failure and enhancing safety on the road. It is also a recommended procedure in many maintenance guidelines for vehicles equipped with air brakes.