break light will not go out on 1997 Audi A8 Quattro

i replaced my front & back rotors,break light still stay on.

Asked by for the 1997 Audi A8 Quattro
problem may be in the master cylinder or the parking brake may be slightly on
no still did not work any more suggestions
I had the same problem with my 1999 a8, took it in to be serviced and they had to replace a vacuum hose which is shaped like a Y,and they had to replace the brake and abs sensors total cost was eleven hundred dollars