While driving the brake lights stopped working

Brake lights stop working while I was driving the truck from a doctors appointment. I have checked the fuses and bulbs, changed the brake light switch, changed the turn signal switch, and I am not getting fire to the brake switch. I am getting fire to the fuse. I tried running a jumper wire to the switch but light still wont work. I cleaned the ground wires under the drivers door and the two on the back of the block, but still no brake lights at any of the three. I ohmed the brake light switch and it is adjusted right. Need help.