sol
Bad dash ground.
Replace the light sensor, it is under dash, 22$ at auto zone, my head lights quit working at night, but brake ligjts & fog lights still worked
Check the switch on the pedal
The two items commonly share a power fuse.
there was a recall on the brake light switch you might want to check into that
There are several things that can cause your 2000 Cadillac dashboard lights to quit working. The most common cause is a blown fuse.
Brake lights often use a dual-filament bulb. If this gets inserted the wrong way other functions can suffer.
If the speedometer and brake lights aren't working then you should change the fuse. If that doesn't work then check the electrical system associated with your Heritage.
Check bulbs Fuse Stop light switch
Low beams are burned out.
this sounds like a fuse or 2. that's where i would start.