New Jersey Air Brakes Practice Test

Why is it important to drain water from compressed air tanks?

1. To improve fuel efficiency

2. Water can freeze and cause brake failure

3. To prevent corrosion of the air tanks

4. To maintain proper air pressure

The correct answer is: Water can freeze and cause brake failure

Draining water from compressed air tanks is vital primarily because water can freeze and lead to brake failure. Air brake systems rely on compressed air to function effectively, and the presence of moisture in the system can freeze, especially in colder weather conditions. This freezing can obstruct the flow of air, leading to a complete failure of the brakes when they are needed most. Ensuring that there is no water in the air tanks prevents ice buildup that could block air lines, create pressure issues, or compromise the entire braking system. This is particularly crucial in areas experiencing cold temperatures, where the risk of freezing is heightened. While the other factors, such as corrosion and maintaining air pressure, are also important, the immediate risk of brake failure due to freezing water highlights the critical nature of this maintenance step.