Rear light sockets

Alright so I'm trying to wire in my digi tails kit but I can't figure out what wires are the turn signal and the brake light, there's a brown and a black wire running to the socket.
Bumper off? Taillight assembly out? Can't remember now but I just set my taillights in the trunk and hooked em up with wire nuts and figured it out trial and error. Think one is running\parking lights and one is the brake lights.