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Be VERY VERY CAREFUL using reverse in low range. And by "very very careful", I mean you probably shouldn't do it. TMs, dash plates and Steel Soldiers members alike caution against it. Using reverse in low range is an easy way to crack the transfer case housing wide open. Some folks say it should...

I also agree with Artisan's comments about air brake lag. Air brakes are great, but they behave a bit differently than hydraulic brakes and they take a little getting used to. When I went to trucking school, getting a feel for the air brakes was one of the very first lessons. As I recall, we...

That is normally correct. But, it is possible for the front axle to not engage in low range, either from misadjustment or deliberate modification. After spinning my wheels some on my M923 shortly after I got it, I figured out by dumb luck that my front axle didn't automatically engage in low...

The treadle valve is the valve body that the brake pedal is part of, under the driver's side of the dashboard. I don't know where the various check valves are, though. I haven't dug that deeply into my M939-series brake systems yet.

Getting an air brake ticket is highly advisable, but it still won't answer all of the OP's questions. When I took my CDL training and passed my test, the training included the dash-mounted air brake controls used in common civilian semi tractors, and didn't cover anything like the combination...

There should be a shutoff valve on each of the two rear glad hands. If the one on the passenger side (the emergency connection) is open, then that will keep the truck from building pressure. I think that having the one on the driver's side (the service connection) open will only bleed pressure...