This happens all the time when people do tail eliminator kits. A little search on the forums will give more insight. My guess is the wire to the actual brake light was pinched and the vibrations finally caused it to cut and short. You probably blew a fuse as well.
As said above, trace it out. Look for loose connections and cut wires. Who knows, you may have just had the filament in the bulb drop. You could check it and make sure the 2 wires in it are in good shape.
09 Aprilia RS125 plated
06 Paul Smart Sport Classic NFS ever.
08 S4RS Tricolore #081 NFS ever.
01 M600, aka, The Pink Monster
97 900SS CR
72 Norton Commando 750
03 KX60 with S4R rear shock,Honda CB350F, Hodaka Ace90, 3x Yam-YGS1, Yam-CS3 200, Vespa small frame, Gilera 106, Puch Sabre, Puch 50 Boy Racer, Benelli 250, Benelli 360, Honda CB350T, and many more.