To move the car with a busted brake switch, turn the key to on, but don't start the car. You should be able to move the selector to Nutral. Start the car in nuteral, then place it in drive, reverse, wherever. Just don't put it into drive untill you get where you need to be.
And yes, it is the switch or the wiring. You can probably use a mutlimeter to test the wiring.
-Dan