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Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil

A Should be removed regularly
Explaination
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.
B Are necessary for the proper function of the air brake system
C Should be added if low
D Are not concerns