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Yep. Been there, done that. Did you put the cardboard in to protect the switch when you removed the right-side switch housing? (fyi - the end of a cable tie works just as well). I was overly confident in my abilities and broke the switch last year. Sounds like you did the same thing.
No intent to "hi-jack" this thread, nor any intent to be sarcastic, but how does the brake switch break?
The plastic nub (is that a real word) breaks off when you try to put it all back together if you don't use cardboard or the big end of a cable tie as a spacer. The metal tab of the brake lever will push on the plastic end of the brake switch and sear it off... Thus breaking your brake.