As that plunger is depressed when you push on the brake pedal the contacts in the brake light switch closed and voltage flows to the brake lights turning them on.
Ford galaxy brake light switch replacement.
Brake light switch is 1 8 pipe threads and the other two are for 3 16 flair fittings.
I show how the ford galaxy built in 2011 comes to the pears from the stoplight.
The switch has a plunger in it that contacts a lever in the brake pedal assembly.
This same switch is used in many millions of ford vehicles.
Ford galaxie club of america 665 so cal galaxies.
This is a video to show how i made the brake light switch work properly on a 1993 ford f 350.