Brake pedal draws power stalls car

This car has manual brakes so I'm assuming its not a vacuum leak. As soon as the pedal is touched the ammeter pegs out to zero and the car stalls. The car has an electronic ignition and if I hit my brakes and gas at the same time it missfires pretty bad, so something is drawing a lot of power when I hit my brakes. I'm going to start tracing wires tomorrow and see what I find