What could happen if the tanks are not drained regularly?

Answer: B — Brakes may become ineffective

When air brake tanks are not drained regularly, moisture and contaminants can build up within the system. This accumulation can lead to multiple issues that significantly affect the performance and safety of the braking system. Water in the air brake system can freeze in colder temperatures, which can block air lines or cause the brake components to rust. If the moisture enters the brake chamber, it can create inadequate braking action, resulting in brakes that are ineffective or less responsive. Therefore, regularly draining the tanks is essential for maintaining effective braking performance and ensuring the safety of the vehicle. Maintaining the air brake system by removing moisture helps prevent these complications, thus keeping the brakes functioning at their intended capacity.