Boy do I feel dumb. I had the same problem. I took it to an autoparts store and they replaced the turn signal bulbs thinking they were the brake lights. Obviously the brake lights still didn't work. I then checked every fuse on the car and even changed the brake light switch. Then the shop finally realized the brake lights were on the top above the turn signals. I couldn't believe it.
I am having the same problem. Checked all fuses and replaced all bulbs. Then I replaced the brake light switch and still have no brake lights, except the one on top of the cab is working. The ones on the tail are not. Please help!