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Manual air tank drains should be:
A.  Opened to drain the tanks after each day.
B.  Left open while driving.
C.  Sealed with glue.
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. Manually operated air tank drains must be opened daily to remove this build-up.
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