Volvo VNL 780 Operator's Manual page 310

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All air tanks on the vehicle should be drained daily. Empty any moisture from air tanks by

pulling the drain valve wire or by opening the drain cocks and allowing the air pressure to

drain completely. Make sure the drain cocks close properly after draining. During draining

the tanks should be checked for condensation fluid even if an automatic drain valve is

When draining the air tanks, do not look

into the area of the draining air. Dirt or

sludge particles may be in the air stream

and could cause eye injury.

Trucks with Wabco air dryers: Periodically drain the purge tank to check for contamination,

water, oil, etc.

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