Becca,
Sorry to keep peppering you with requests for details, but you seem to have gotten more into the nitty gritty than most of us.

Regarding brake light switches. I assume you have them sealed in some kind of small plastic enclosure like some of the ones allelectronics.com sells. You mention that they are attached to the caliper. How is the switch actuated, ie, what presses the button?
Thanks,
Raymond