How do you replace a brake switch on a 1999 GMC Sierra 1500?

To replace the brake switch on a 1999 GMC Sierra 1500, start by disconnecting the negative battery terminal to ensure safety. Locate the brake switch, which is typically mounted above the brake pedal. Remove the wiring connector and the mounting nuts or screws securing the switch, then take out the old switch. Install the new switch by reversing the removal steps, ensuring it is properly aligned and reattach the wiring connector before reconnecting the battery.