What may happen if water and oil are allowed to accumulate in the air tanks?

When water and oil accumulate in the air tanks, they can lead to serious issues, particularly in cold weather. The presence of moisture in the air supply system can cause the water to freeze, leading to blockages in the air lines and potentially freezing the brake valves. This freezing can impair brake function and result in brake failure when the driver needs them most.

Proper air tank maintenance is crucial to ensure that water and contaminants are regularly drained, preventing them from affecting braking performance. This is especially vital in colder climates where freezing conditions are common. The correct choice highlights the critical relationship between air system contamination and safe vehicle operation in adverse weather conditions.