brake light
The odd thing is that when this switch acts up, it typically works the other way - it tends to stay on all the time, even when the brake is released.
If I recall correctly, the switch makes contact when the brake is off and breaks the circuit when the brake is on. So, maybe it has come apart on you and is creating a short circuit and making contact all the time? If you take off the full center console, you can access the switch and see what is going on.






