I have a 2000 Audi A4 Quattro that I picked up from a fellow and so far love it. The other day I had the Brake Light warning appear and sure enough the right and left rear brake lights are not working however the center one in the window is. I chose the easiest fix and replaced the light bulbs even though they appeared ok and still no brake lights. I then replaced the brake switch with a new one and still only the center brake light works. I replaced the fuse even though I knew it would not fix the issue and sure enough no lights.

I am out of ideas as to what it could possibly be so I turn to the pros at the forum. Any ideas are much appreciated.
Thanks.