There's a switch on a stamped light metal u-shaped frame that goes around
the heavy pin connecting the pedal arm to the brake actuator shaft.  

The switch connecters face back toward you.  Those wires tend to break
right at the connectors so it may not be obvious till you know what you are
looking for.

If you want to remove the switch,>> not necessary,<< you pull the wire clip
on the end of that heavy pin, retain the nylon washer, slide the switch and
act shaft to the right so the outside of sw frame clears then push sw assy
up. The other side of the switch frame is u-cut so it can be easily
removed.