How do you change the brake light switch on a 89 Chevy van?

To change the brake light switch on a 1989 Chevy van, first disconnect the negative battery cable to ensure safety. Locate the brake light switch, which is typically mounted above the brake pedal. Remove the wiring connector and the mounting bolt to detach the old switch, then install the new switch in reverse order. Finally, reconnect the battery and test the brake lights to ensure they function properly.