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Question:

Why should air tanks be drained completely?

A Because compressed air typically consists of water and some oil, which can be bad for the air brake system.
explanation

It is important that you don't let water and oil build up in the air tanks. If you do, the brakes may not work correctly. Each tank has a drain valve on it and you should drain each tank every day. If your tanks have automatic drains, they will keep most moisture out. But you should still open the drains to make sure.
(According to CDL Handbook)

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