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I need a good couple day class on air brake theory and operation myself. 40 psi overnight is nothing I'd worry about. That's normal for most air brake trucks. Sent from my SM-G900V using Tapatalk

No that square plate under the engine has a air valve behind it. Sent from my SM-G900V using Tapatalk

Good info there! Sent from my SM-G900V using Tapatalk

Mine will lose 60 psi overnight. How bad is yours? Sent from my SM-G900V using Tapatalk

Honestly I don't know, how much is it losing and how fast? Cause we're "supposed" to be draining the tanks daily. If I don't I tend to have a valve stick during cold mornings not allowing the brakes to release. I use a spray bottle with dish washing soap to find air leaks. Sent from my...

It's in the TM section at the top of the main page. But it doesn't help you, if you don't have anything to download it to as in my case. As far as locations of the air tanks, follow your lines back that lead from the drains on your passenger side. There are only 4 tanks. Sent from my...