Check the brake fluid pressure switch, located on the bottom of the master cylinder. They are known to fail, and leak brake fluid. They can also short out and blow the fuse, or even catch fire.
I would unplug the brake pressure switch, and see if that keeps the fuse from blowing. If it does, you will need to buy a brake pressure switch replacement kit from your dealership. It is VERY easy to replace.
I would replace the switch if it is even slightly damp with brake fluid.