If your car has an automatic brake pedal switch, there is a good chance that it will need to be adjusted at some point. Here is how you can adjust a brake pedal switch:
1. Park your car on a level surface and set the parking brakes.
2. Locate the adjusting nut on the back of the pedal switch.
3. Turn the adjusting nut clockwise or counterclockwise until the brake light comes on when you depress the brake pedal halfway.
4. Test the brake lights to make sure they are working properly.