Q: no brake lights on 2004 Cadillac CTS

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I have no brake lights. All other lights and blinkers are working. I have did everything as far as what the manual says with the bulbs and fuses and they still don't work. (At least I think I have). Also had someone look into the brake switch and seems to be no problem there either.
(1) Answer
(1) Comments
it could be one of several things use the process of elimination, it could be the fuse, the brake light switch, the brake light bulbs or it could be the module for the brake lights if your car has one for that system
talked to someone at dealership and they also said culd be the module because it does have one. wanted to try make that the last alternative because said if it is the module its expensive.