Dumbest question you've heard...draining air tanks?

Well gotta be there. Might just be a gate valve.

 

If its not by the fuel cap it may not have one. Just look along the frame on both sides and ask the shop if you can't find it. Just be honest and you won't look like a fool. Go in asking like this: "I've looked all over the place and cannot find the air tank drains. Am I blind or is there not a drain I can reach?" That way you come off as wanting to learn instead of comming off as an idiot.

-Steven

 

In 6 months I never found mine, though I only looked once and not for long

 

there's a panel on the top step on the driver's side. open it and reach in.. feel for a thin cable.. all are usualy on the driver's side. pull on the cable

 

There are usually two cable pulls near the battery box and two near the frame rail near the rear steps.

 

I did that recently, I asked a more experianced driver, and he wasn't sure either, asked another he should me where it was on his (these are all the same military tractors). I went to mine, and it didn't have the cord any more, wrote it up for the shop.

 

Roll around on the ground, get under neath, look at the bottom of the tanks, the pull cords will end there. Then follow them up to where the pull lanyards are located.

 

Crawl under there, you'll see air tanks. I'm sure it's a real challenge running a semi truck without some.
Nothing online? Freightliner help link?