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So if brakes apply by putting air in the red line, to make it work he must hook to the service line on the truck, which supplies pressure when the peddle is pressed. That makes sense. But he is not "legal", in that the breakaway is not functioning for over the road, knowingly, under DOT...

Goldeneagle, If they have not got breakaway, (per the above) they are not legal for normal civilian use that is subject to a DOT inspection. There seems no choice but for entropy to make them work right, including the breakaway feature. In the double cylinder, the spring is used for that...

From USDOT "(b) Emergency brake requirements, air brakes. Every truck or truck tractor equipped with air brakes, when used for towing other vehicles equipped with air brakes, shall be equipped with two means of activating the emergency features of the trailer brakes. One of these means shall...

One final thought...to apply the brake with pressure as a normal air brake, the pressure must go to the rod (service) side of the cylinder. Putting pressure to the emergency side would normally release the brakes...but that is not the case here, if one is to believe the attachment...

Yes trukhead, I think you have it right. The e brake takes pressure to release and the service line applies pressure for normal braking. If his brakes apply by putting air to the red line (e brake), then there may not be a spring inside that is "caged". Someone may have removed it. How else...

Wait a minute, is entropy right about the brakes service application on the modulated release of pressure, like he stated above?... because I thought the 923 worked on the application of pressure...exactly the opposite (like your video hemichallenger).

So the fact that his condition where no air supply means that he has no brakes is due to the bolt being adjusted in so the emergency side is not working?

Hemichallenger gave you the info I believe, in that it releases with equal pressure and applies upon loss of service pressure. The emergency air would apply the brake while service air is released. That would work great on a vehicle that works that way...but I don't think your 5 ton does. I...

If you google air over hydraulic brakes, I think you will see two systems, of which you have the kind with no break away brakes. You may need to have a tank and valve for making it modern.