Hi , my bronco's rear lights never really worked properly. I haunt has turn signals since I got it .No big deal but now my brake lights wont turn on at all first they would stay on even with the truck off so I figured brake switch and bought a new on and replaced it .But the same problem tail lights work good just no brake lights .Any clues on wher to start wpuld be great thanks. Ps .If I flip the blinker either direction the tail light on that side of the vehicle cuts off until in the neutral position again . Hecked fuses as well not blown

 

suggest you first check all your ground connections to you light sockets.
check the resistance from your sockets to body ground.