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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