Its your brakelight switch stopper that went bad. The brakelight switch is a plunger which when depressed turns ur light on. Normally when ur brake pedal goes back up there is a plastic piece that presses the plunger in and deactivates your brakelight. That is the piece that fell out or cracked on your car. you can just get some door trim retainers or a bolt and nut and stick them in the hole behind the brakelight switch plunger. Thats all it takes. Lemme know how it goes