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Move the switch until it opens the contact when the brake pedal is pushed down 1/2".
The power on switch
A normally closed switch is a switch that is normally closed. When you operate it, it opens.
A mercury switch is an electronic switch that opens or closes a circuit when the switch, or device it is attached to, tilts.
opens and closes the circuit
I went crazy looking for the door jamb switch on my 2001 Denali. It's attached to the locking mechanism inside the door. The latch has a gear which drives a mating gear that activates the switch. When you pull the door handle, the latch opens and the gear moves.
It opens and closes like its breathing.
The switch.
opens and closes the circuit
The switch has a small internal spring that tries to push the pin out. The pin when pushed in opens or breaks the circuit.If that pin does not work like that, and it does not take much spring force, than throw the switch away. Not normally rebuildable.
A switch.
No a switch just opens and closes a circuit. A switch can be replaced by a dimmer switch. The dimmer switch will fit in the same enclosure that the switch is removed from.