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You have a short in the cross over wire. Almost all cars and trucks have one main break wire with a second wire "y" in off to the passenger side . You could just wire in a cross over and disconnect the old one.
There is a module on the passenger side behind the rear wheel mounted to the body. It goes bad. On the drivers side is where the grounds are located, on or close to the frame. Check these first.
I doubt there are two separate switches. I also doubt that there are two wires running from up front to the back. There is most likely a single wire going to the brake light on the driver side and one going from there to the passenger side. It either this wire or a connector that you should be looking at, assuming that you have replaced the globe!
Did you try the passenger side brake bulb in the driver side socket (maybe the new lamp is bad)?? If it works, then the problem is either a bad ground connection / wire at / between chassis and the shell of brake lamp socket, or bad 12 volt wire at / between the common passenger 12 volt brake light wire in the harness to the center contact on the brake lamp socket. My suggestion is if the brake lamp wire is ONLY for brakes - not the directional too, simply add a new wire spliced into the passenger side brake light wire and extend it to the brake light wire closest to the new socket that you recently installed on the driver side. Disconnect the vehicle brake wire from the new socket and wire nut it off or tape it up (so it can't short out if it somehow becomes energized again) and splice this new wire to the new socket. Test & you're done!
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