Do you have a towing light harness installed? It's usually the culprit to many electrical gremlins. If so, you might want to remove it and see how yer T-100 fairs after that.
Do you have an alarm system installed?
Easiest way to test yer bulbs is to pull them and test them with some 12VDC directly.
Yer brake light could be from a low brake reservoir...top it off. You might also want to check yer brake system (pads/shoes) fer wear.
1998 T-100 SR5 2WD auto, Roadmaster Active suspension, oil catch jar, AC mod, aero cap, lower aero package, 67% grill block