Why must air tanks be drained?

To remove water and oil.. Section 5.1: Water and oil can accumulate in the bottom of the air tank. If water freezes in cold weather, it can

Why must air tanks be drained?

ANSWER BREAKDOWN
  • A. Incorrect. "To drain all the air out of the tank." is not correct. Water and oil can accumulate in the bottom of the air tank. If water freezes in cold weather, it can cause brake failure. You must drain them to remove water and oil.
  • B. Correct. Water and oil can accumulate in the bottom of the air tank. If water freezes in cold weather, it can cause brake failure. You must drain them to remove water and oil.
  • C. Incorrect. "To check for leaks." is not correct. Water and oil can accumulate in the bottom of the air tank. If water freezes in cold weather, it can cause brake failure. You must drain them to remove water and oil.
  • D. Incorrect. "To test the safety valve." is not correct. Water and oil can accumulate in the bottom of the air tank. If water freezes in cold weather, it can cause brake failure. You must drain them to remove water and oil.