Check the fuses for your brakes.
the turn signal switch is probably bad
check fuses then check all the bulbs, then check the turn signal switch the brake lights work through it
Since most brake/turn use the same filament in the bulb(1157) then if the turn signal switch is bad or offset then it will effect the brake lights.
blubs blown? Check the turn signal switch.
It depends on the exact problem. If it's that both brake lights in the back do not work and the middle one works, it could be your turn signal switch.
it is the turn signal stalk. here is a good writup for repair. http://tss.likeabigdog.com/
I'm guessing you're talking about your turn signal light. From what you wrote I think I'd have to say it sounds like a bad turn signal switch. The brake lights run through the turn signal switch on mostly all vehicles.
Check and make sure you have the correct bulb. The turn signal/brake light is a dual element bulb and if you have a single element it does not work properly.
Check turn signal switch. Pull back lighty on turn signal lever and brake lights will come on. Replace switch inside steering column. The green and yellow wires you see at the bulbs are the ones that control the brake lights and turn signals.
It could be a blown fuse. Tail lights and brake/turn are on separate fuses. Apparently there is not a ground problem since brake/turn works OK.
It's the turn signal switch which is the culprit.
i have conected the black and red wire to the brake and it works (the brake light that is) and i conected the blue and white to the signal lights each wire being left and right signal and it all works. but when i brake all of the light lights up the red bar for the brake and the orage bars left and right when i signal left or right whiles braking the signal works but the other signal light sticks on with the brake light. so if any one as any idears please let me know thanks