2000 Chevy Silverado 1500 My rear brake lights are not working. We changed bulbs, checked fuses under dash side and under hood, replaced the brake switch and replaced the Junction Box. What can I do next to find this problem? Help please.

 

You will have to go step by step to find the problem. First with a volt meter see if there is voltage going into the brake switch. If there is voltage then see if there is voltage at the socket for the bulb. I have seen faulty sockets on many occasions. If there is no voltage going to the brake switch then trace it back to the fuse box.