I had the EXACT same problem not long ago. The problem was in the fuse box itself. When I was pushing the fuse in, it wouldn't make a good enough contact so no current would flow. The only way I noticed was I had the brake pedal switch hanging, which was the same as the brakes being pushed constantly, and was checking all electrical stuff. I was doing this at night. I just happen to see the brake lights come on briefly and a small flash like an arc at the fuse while inserting it.
This might not be your problem but it's something you could easily check if you've eliminated alll other components related to brakes.
check this link: