If you're asking about the ones at the corner, the whole housing comes out to get to the bulbs. Just pull back the carpet lining, and you should see a few nuts that hold the housing in place. If you're referring to the high mounted brake light in the rear window, that should be accessible from the trunk.
Save yourself some grief and take it to a repair shop
Front or rear?
you need a new brake booster
if the check brake light is on, the accumulator is bad. this part will run 700.00for a rebuilt one. the other option is to replace the brake system with a non anti-lock brake system
If you mean the brake light, you just have to change the bulb or bulbs.
1998 Lincoln Mark VIII brake light bulb replacement: Purchase the correct replacement brake light bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement brake light bulb information. Then consult your owner's manual for the replacement procedure. As simple as it sounds, the owner's manual is the best place to start for brake light bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
in the panel located on side of dashboard open drivers door to see it
Have you checked the brake fluid level in the master cylinder it may be low causing a light to come on . i did the level is ok.
Probably the best bet is to check on E-Bay
If you mean the brake light that is on the inside of the car, the top pops off and then you can see the bulbs, if you mean the tail light, you have to open the trunk and remove the rug like covering so you can see where the bulbs go. Turn the bulb casing that is burned out and replace the bulb. Same is done for the turn signal.
If its the same as the mark viii then you would have to replace the bulb by removing the light that is held in with 4 or 5 screws then you can take out all wires and bulbs you need to.
Go to www.markviii.org then to technical help they will guide you to a site where you can order a ballast.