How do I check brake light switch?

To check the brake light switch, start by locating it, usually found near the top of the brake pedal assembly. With the ignition on, press the brake pedal and observe if the brake lights illuminate. If they don’t light up, you can test the switch with a multimeter to see if it’s functioning; if not, it may need to be replaced. Additionally, inspect the wiring and connections for any damage or loose connections.