RVBuzz,
One thing that might be interesting is to connect your orig. booster externally. By this I mean to take it out of the box, and connect the vacuum hose. I expect you will notice the same vacuum leak. but you might be able to use a chalk puffer or anything that makes smoke to see if you can tell where the vacuum leak is.
I assume it would be some kind of fitting, maybe you can figure out how to plug it when towing.
I can't thin of a reason for a vacuum system to have any kind of built in leak.
This would mean that after a couple of minutes, you would have no vacuum assist if you pressed on the brakes without the engine running.
Regards,
Dan
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2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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