The brake lights work regardless of the ignition switch. There is normally a switch mounted under the dashboard, that presses against the brake pedal hangar. Normally, when you press the brake pedal, this switch loses contact with the hangar, and the brake lights come on. If the switch gets broken or out of adjustment, the brake lights can stay on at all times. This will eventually kill the battery. Readjust or replace the brake light switch.
SOURCE: brake lamp light on a 2002 Honda Accord SE
I assume you mean the one on the dash. This is an indicator that there is a problem in your braking system. Make sure it's not low on Brake fluid and have the brake system checked or check it yourself. If your going to check it yourself I recommend the Haynes repair manual on your vehicle as a reference.
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