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Air tank drains:
A.  Should not be used in cold weather.
B.  Are helpful to remove water and oil from the air tanks.
C.  Are used to move air to the brakes.
Compressed air in an air brake system usually has a certain amount of water and oil in it. This can harm the system if allowed to accumulate. Air tanks have drain valves to aid in removing water and oil from the compressed air.
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7.75 % of our users get this question wrong.
This question's difficulty is Medium

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