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Why do you need to drain air tanks regularly?
A.  Because the air gets old and needs to be replaced
B.  Because compressed air contains some water which must be drained from the tanks
C.  To allow for a change in air pressure
D.  To remove bad air from the tanks
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.
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