Brake lights not working

[mbaig2926]

I have a 2002 A6 Audi. I can't figure out why all the brake lights aren't working. I changed the bulbs, checked the fuse. What do I need to do next?? Also, the ABS light is lit on the dashboard - what could this mean?

[Lex Luthor]

The brake switch at the pedal is duff