Most likely the plunger in the brake distribution block needs to be reset. The block is the brass H shaped thing in the front trunk.
The low brake pressure sender screws into it in the middle.
Once it senses low pressure in either the front or rear system, the internal plunger engages the switch and sends voltage to the brake light.
This can happen during a brake line failure or installation of new brakes in the car.
If you just put brakes in the car and paid someone to do it, don't use that shop again. This would be an inexcusable mistake by the shop indicating they are dangerous numb nuts and do not understand the brake system in your car.
Now to cop an attitude like "but I never saw anything like a Pantera" doesn't cut it either. The same system is used in the Mustang from it's inception until computers took over.
If it's your fault, shame on you. Go sit in the corner.