I'm with Jerry on this one as it just happened on my 2000TJ. It's a $20 part from a local parts store. It is painful to get to, it comes out with a 1/4 turn and pull. Do a search on here to find out and how to test it. Very simple fix.Could be the brake light switch mounted on the upper part of the brake pedal mechanism... in a back-breaking location to get to and work on.
^^^This is a good bet. Since it's just the brake lights blowing the fuse and not the turn signals, chances are there is a rogue wire being grounded in the multifunction (turn signal) switch. From the switch to the back lights, turn signals and brakes use the same wiring.On mine it was the multifunction switch don't go aftermarket get oem I used a neon one from u pull it as neons stay dry inside and are more available than wranglers