Fuse panel old ones appeared to be good

I've replaced the brake lights, the old ones appeared to be good but replaced them anyway. I've also looked at the fuses and they appeared to be good but didn't ohm them out to be certain. I do have backup lights, rear turn signals, and tail lights but neither left or right break light works. I forgot to mention, the 3rd brake light above the cab back window also does not work. So, the only thing I can think of next is the brake light switch above the brake pedal. I hear it click but don't know if it is working. Other than replacing it, is there a way to test this and is there something else I should examine? Thanks! -Larry