Originally that brake relay had a mounting tab on cover and was attached to a stud on back of false firewall. Maybe tab broken off or relay changed out with one without tab on relay cover.I had this problem occurring from time to time until the BRAKE and STOP lights stayed on when brake pedal was pressed. I'd like to add a note to this thread that it may also be the relay (grey? 20A) behind the false firewall. I don't know where or how it should be attached but mine was just laying there so that water could get into the relay and cause the malfunction.