Electric brakes

[TayzGpa]

I hope I can explain this with some level of clarity.

I have a "new-to-me" 2016 Montana 3711FL.
A couple of weeks ago, I had a blowout on one of the rear tires.
When the tire blew, it cut the brake wires on the wheel in front of it.
I have replaced all 4 tires with new ones and while I had all 4 wheels off I pulled the brake drum off of the "wire damaged" front wheel and reconnected the wires using a couple of wire unions.

I wanted to make sure that the brakes worked after reconnecting the wires on the wire damaged wheel. So... while I had the trailer jacked up I connected the 5th wheel electric cable to the truck bed connector in my 2012 Ford F350. Started the truck and while I spun the wheels, my wife would apply the break pedal.

I did two brake tests to make sure they worked and here is what I found.

First test used the brake pedal in the truck.
While applying the break pedal, only the rear wheel on the opposite side of the trailer (opposite of the blowout wheel) would stop. I could here the blowout wheel hum but it never engaged fully. Neither of the front wheels engaged.

Second test did not use the brake pedal but used the manual "slider" switch in the truck cab.
When the "slider" switch was applied, both rear wheels would stop and one of the front wheels. The "wire damaged" wheel never stopped.

I don't have a clue how these electrical brake systems work. Is it normal for only the rear wheels to engage when the brake pedal is applied or is something else going on.

Any info would be appreciated.
Thanks in advance.