need draining air tanks advice.

If your truck has a working air dryer (as virtually every modern truck does) you should not be doing as you're doing. When you open the valve, do you see actual water blowing out? I doubt it. Pull the cable or turn the valve momentarily once every several days should be more then adequate if your dryer is working. But do not leave open to drain all air. This is a waste of time and a runs a risk of having other issues.

 

I wouldn't leave valves open all night in some of the cold states I run in..
but I only drain my tanks 1-2 a season and then I do it when I am on a southerly run in warm weather.

and

The loss of engine power to 3mph is a regen issue not brakes.

 

I call troll on this thread and this needs closed by an admin.

 

More specifically a "not adding DEF fluid as required" issue. Yet another "truck driver" out there with zero knowledge of the systems on modern trucks. If a trainer was ever involved they should be removed from the position, if no trainer was ever involved, how does one get a CDL with no knowledge of basic truck systems? SMH .... again

 

I only said troll because I wouldn't expect anyone with at least a day of training to assume that the air tanks and the engine derating were somehow related.
Def will derate, low coolant will shut it down.
If I was you I'd ask for more training or your gonna have a very rough time out here.

 

Power loss and regen are exhaust issues. Either no DEF or has to burn particles off of the exhaust filter. If it happens too often you may be idling too much or have a problem with your exhaust system. Has absolutely nothing to do with your brakes.

 

I see proof of that every day I'm on the road.

 

Well you don't learn anything about DEF or regen to get your CDL. Private schools teach you to pass the DMV test and lot of small companies do not have trainers. I went local straight from school with no trainer, had me drive around for 15 minutes to make sure I could drive the truck, then here are the keys go to work. I had basic mechanical knowlage, but had to ask the other drivers a lot of questions. Never dealt with DEF or regen, the trucks in school were too old for that.
I know 2 students from my school went OTR as a team together straight out of school with no further training, a couple others went solo OTR without a trainer.