How do you change the brake light switch on an Audi A3?

To change the brake light switch on an Audi A3, first disconnect the vehicle's battery to ensure safety. Locate the brake light switch, which is typically positioned above the brake pedal. Remove the old switch by disconnecting the wiring harness and unscrewing it from its mount, then install the new switch by reversing the process. Finally, reconnect the battery and test the brake lights to ensure they function correctly.