2006 Chevrolet Silverado Brake Lighting

Have you chcked the fuse in dash, they are seperat e for t/s upper light and rear brake lights. It will say veh stop fuse.

You 'll have to check to seeif power is going to brake lights form t/s switch its' the lt blue wire when brake is applied. If it goes there then it may be a ground issue or a bad bulb as I think the brake light bulb is separate from t/s bulb in back. Then check to see if you are getting power for brakes at taillight, it's two screws to remove taillight with tailgate down. If you are getting power it may be bad contact or a bad connector in taillight socket.