Brake Pedal Return

This is an issue for my Barracuda. I haven't had time to get to the root of the problem. The brakes work fine but the pedal doesn't come up, leaving the lights on. So uh..I temporary assessed the situation with a carb spring that attaches to the pedal and stretches up under the dash...just until the carshow season is over and its parked long enough for me to work on it.