How do you replace the brake switch on a Cadillac CTS 2003?

To replace the brake switch on a 2003 Cadillac CTS, start by disconnecting the negative battery cable to ensure safety. Locate the brake switch, which is typically mounted on the brake pedal assembly; you may need to remove a cover or panel for access. Disconnect the electrical connector from the switch, unfasten it from the assembly, and install the new switch in the reverse order. Finally, reconnect the battery and test the brakes to ensure proper functionality.