Trailer brakes issues

Great posts Gdetrailer, lots of good info, i dont have much experience with automotive or trailer wiring but have LOTS of construction electrician experience, so this stuff is somewhat new to me but i get the basics... i am planning to do the re wire ad previously stated....the other brakes do run inside the axle, my only confusion is whether to run new just to the pigtail from each brake magnet or go right to the termination, im not real comfortable messing with actual brakes themselves..

Thanks aflgain