Check your owners manual. If you don't have one copy & paste this link. http://www.genuineservice.com/genuineservice/en/gloveboxresults
Check engine light is out
How do you replace a heater core in a 1998 Ford Expedition?"
How do you replace a heater core in a 1998 ford expedition?"
Adjust or replace the brake light switch.
You have stumped the wizzard as I find no such animal.
Open the rear door hatch. there are 2 or 3 Philip screws on top of the brake light housing. remove them , pull housing from the frame of the truck. change bad light bulb, reinstall everthing you just took out and your done.
REPLACE THE BULB
Just unscrew it.
brake light switch is mounted by the brake pedel remove lower panel above brake pedel and then you will see the switch should be able to turn the switch to replace
If I understand your post: The brake light is on constantly? If so, you may want to adjust or replace the brake light switch located at the top of the brake pedal.
you need to replace the brake light button under the brakes inside the car
Check on the upper end of brake pedal (under dash)