When should you drain the air tanks if you do not have an automatic tank drain?

Answer: B — After every working day

Draining the air tanks after every working day is essential to maintain the effectiveness and safety of the air brake system in commercial vehicles. Over time, moisture can accumulate in the air tanks due to the natural condensation process. If this moisture is not removed, it can lead to several issues, such as reducing the efficiency of the air brakes, causing corrosion within the air system, and even freezing in colder temperatures, which could impair the braking ability when it's needed most. By draining the air tanks daily, you ensure that any accumulated water is removed, helping to preserve the integrity of both the air supply system and the brake components. This practice is vital for maintaining a safe vehicle and ensuring reliable braking performance. Other options, such as draining tanks once a month, every time you refuel, or once a week, do not adequately address the frequency needed to prevent moisture buildup and the associated risks. Regular daily maintenance is critical for these systems, making it necessary to adopt a routine that focuses on the operational needs of air brakes in commercial driving.