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I replaced my brake booster last year and it appears like the little nub on the end of the rod is what's causing the switch to be pressed if it's installed on the rod, due to clearance. You can see the nub sticking out in the first pic. The second is the switch how i discovered it, and the third is when it's installed all the way on the rod, and the switch is pressed like this. The last 2 pics is of a replacement switch to show how it works. This is in the off position. The only solution I can think of is to remove the brake booster and grind off this little nub on the end. When I Google brake booster, I saw some with a more pronounced nub and some with a smaller nub on the end. Anyone know of a better solution?