Brake lights on the instrument cluster can come on for one of two reasons. It comes on when the emergency brake is pulled up a bit and it also can come on if there is a pressure differential between front and rear brake hydraulic "circuits". This last one tells you there is a leak in the brake system (front or rear) or possibly a bad brake master cylinder (bad o-rings inside) delivering more pressure to one than the other. Temporarily unplugging that switch on the master cylinder would rule that out if the brake light continues to stay on. The first one could be due to a bad or out of adjustment emergency brake lever switch located on the lever mechanism.
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