The brake light switch can fail allowing the switch to remain in the "brake lights off" position or in the "brake lights on" position.
Lights
BMW 735IL Lighting problems by year
0 complaints filed with NHTSA about the BMW 735IL's lights. Headlights, tail lights, brake lights, turn signals and interior lighting failures.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked daily. Complaints are owners' own reports and are not verified. How we use the data