No Brake Lights at All!! HELP PLEASE

I have a 99 Tahoe with no brake lights at all. Turn signals work, hazard lights work but not the upper or bottem brakes lights work. I have changed the brake switch and i have checked the fuze. I don't have a clue why the brake lights does not work. Can someone please help me?!

I had a VERY similar problem... No (bottonm) brake lights, top LED's worked, hazards and turns worked.

Had the dealer replace the Turn Signal stalk on the Steering wheel (It is called a Multifunction switch, I think) and works like a charm now.