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Step 1
Check the fuse. This is always the first thing you should do when troubleshooting brake light problems. Remove the fuse panel below the steering wheel by pulling it down. Some F-series Super Duty trucks have a release latch you must lift up on to remove the fuse panel cover. Remove the fuse for the brake lights using the fuse puller on the fuse cover. Use the fuse diagram to locate the fuse for the brake lights. If the fuse is blown, replace it with a fuse of the same amperage.
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Step 2
Check the brake light bulbs. Bulbs do blow out, so check them every six months. The easiest way to check the bulbs is to turn on the headlights. Since it is unlikely that both brake lights would be out at the same time, step on the brake lights to make sure they illuminate. To be certain that the brake lights are not blown, remove the bulb from the housing. Gain access to the bulb underneath the vehicle. Remove the wiring running to the brake light ballast and remove the bulb by turning it counterclockwise and pulling the bulb out of the housing. Check the filament to make sure it is intact.
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Step 3
Check the wiring running to the brake light housing. If there is any physical damage to the wiring, it must be repaired by a professional mechanic.
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Step 4
Check the brake light switch. The switch can be checked by pressing on the brake pedal. If the bulbs are not blown, the fuse is not blown, and the wiring is in good shape, and you still cannot get the brake lights to illuminate, the problem is likely a faulty brake light switch. This needs to be serviced by a professional mechanic.
