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

Answer: B — Water can freeze and cause brake failure

Draining water from compressed air tanks is crucial primarily because water can freeze and lead to brake failure. In colder temperatures, any moisture that accumulates in the air tanks can turn into ice, which can block the air lines and disrupt the proper functioning of the brake system. This blockage can hinder the ability of the brakes to engage or release as needed, thereby compromising vehicle safety and control. Ensuring that the air tanks are regularly drained eliminates the risk of ice formation, thereby promoting reliable brake operation and overall safety on the road.