i have replaced the bulbs, the switch, and the fuses what else could it be?

billie damerst, March 2008

BG is most likely correct, especially if the Hazard Light Knob has broken off. GM used (may still use) a combination Hazard/TurnSignal switch, thru which the Main Brake lights are routed. Check to see if the Cyclops (upper) Brake Light is working. If it is and the main (tail) Brake Lights are out. The upper light does not route via the Combination Switch. Autozone carries the Combination Switch for around $50.00.

1995 Chevy Lumina Owner., July 2009

There might be a problem with the turn signal switch in the steering colum ....brake wiring goes thru this ...
I have had this problem before .....25 years GM tech

bg, March 2008