I will add that the brake lights worked fine before I parked the car 4 years ago for a LS swap. It has Dakota Digital led tail lights that work very well except for the current issue. Pardon the pun, lol.
Unplug the brake switch and see if the lights go off. If they do not then the lights are getting power from something else. If they go off then it should be the switch that was unplugged OR needs to be adjusted.