Stop Lamp problems :(

[Abishai]

Ok here it goes...
The other day I wasd fallowed by my parents they tell me I have no stop lights.

I check bulbs good.
I check Fuse good.
I check the Brake switch by the brake pedale. Went to Chevrolet got a new one. Still lights do not work.
The bulb lights up with parking lights but not go brighter when braking.

Any one with any ideas would be helpfull.

PS: I also have no backup lights if that helps. I checked the bulbs on them and the fuse for that all good.

I have replaced all bulbs and all fuses.