This one will require either another person to help (Austin helped me with this one), or a heavy item like a brick that you can place on the brake pedal. With the pedal depressed, walk to the back of your vehicle and make sure all of the brake lights are light.
Yes, I took my plates off for these pictures. If you want my plates do the work and look them up yourselves.
If there are any that are out swing by the auto parts store and get replacement bulbs. These are usually easier to change than your headlights as the trunk has more space to work with and you don't have to take out a battery to access them.