One problem related to brake light on has been reported for the 2004 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford F-150 based on all problems reported for the 2004 F-150.
I own a 2004 Ford F-150. In 2012 I had my e-brake light start flashing at me. I brought it into the mechanic and had them look it over, they said they couldn't find anything wrong other then the wiring under the dash was probably bad, so I brought it to a brake specialist and they said the same thing, nothing wrong with cylinder or brakes, that it was the wiring under the dash. I'm truely not safe using my e-brake as I'm not sure if it is working or not. My interior lights started coming on also when I would turn on my headlights, everyone knows you shouldn't have the interior lights on while driving at night anyway. I have read several articles where other Ford F-150 owners are having the same problems. I think this needs to be looked into and a recall should go out.