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You have a primary and secondary tank. Certain air functions of the truck use the primary and others use the secondary tank.

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Q: Why do semi trucks have two air tanks?
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how do I adjust air breaks on semi?

Semi-trucks are equiped with two brake lines. One in the normal air brake line and the other is the emergency air brake line. If your normal breaks fail, the emergency break will automatically switch on so you will be safe until you can stop. That is how you will tell your breaks fail-your emergency break will initiate.


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You are supposed to drain your tanks daily, especially if your truck has only two tanks, and doesn't have a wet tank.


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