Manual air tank drains should be:
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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This questions appears in the following tests:
Alaska Practice test 3
Arkansas Practice test 15
Connecticut Practice test 1
Iowa Practice test 4
Louisiana Practice test 14
Louisiana Practice test 16
Nevada Practice test 1
Oregon Practice test 4
Utah Practice test 1
Virginia Practice test 15