First thing I think is the only reason the fix you did would work is the brake wire got into your light circuit. DUUUHHHH. hehehe anyway at least you know it got to your headlights and is gone. Since that general area took care of the headlights possibly due to your fix. This could get long. I'll leave stuff out.
Check if the brake lights work with the light that come on in the front disconnected.
Watch and see if the turn signal lights are coming on when you hit the brake.
Pray like heck the fix wasn't just getting lucky moving some wires that are bare down there when you moved the dash panel.
The quick fix if it starts smoking is shaking your hand around in the wires to disconnect the short.
Look for a brown wire that comes down with a yellow. Yellow is headlights and brown is parking.
You might have a short where the headlight, running lights, and brake system light come together and head thru the firewall.
I'd get some electrical cleaner and practice holding your breath. Get the non toxic spray. No chlorals or non crc I think. Practice holding your breath anyway and remember to blast some air out your nose before breathing back in.
After that practice try attacking the black triangular wire bus under the dash I think to the right of the fuse panel. All the wires come straight out towards the rear of the car. You can't miss it. It's right behind the brake pedal.
Clean that good.
You gotta check to see on the other side below the brake booster if somebody did splicing.
Do you have a leak when it rain? That area gets water coming down the inside of the firewall and corrodes up.
Good luck and have fun most importantly