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Failing to drain the tanks in an air brake system can result in

A Water freezing and causing brake failure
In an air brake system, the air storage tanks must be drained to remove accumulated water and compressor oil. Failing to do this can cause damage. For example, water that has built up in the system could freeze in cold weather and cause brake failure.
B Squishy brakes
C Too much air collecting
D Too much fuel being carried