Air dryer on my cascadia. It's near the passenger side steer. I have two tanks, one behind the cab and one under the cab. If I flip down the def cap cover or battery cover there's cords I can pull to drain that one.
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I'm currently driving a Ryder Freightliner M2 106. When I drain the air tank at the end of a shift, only one air gauge is going to "0" - the other one shows a tank fully charged. I cannot find but one tank, but I'm told this particular truck has an "air dryer" which filters out water, etc., from the air so that only air is pumped into the air tank. If so, where is it, what does it look like, and is it supposed to be drained the same as the tank?