New bulb needed or broken wire
this tells you is a simple wiring problem.most likely a loose wire from the third light to the other lights.(third lights provides the power to the other lights)
There could be a separate fuse for the lower brake lights , or maybe both lower brake light bulbs are burned out
it would be the brake light switch about 20 dollars at autozone
The 2001 Chevy Blazer brake lights may not work and the third bake stays on because the current light needs to be replaced. A replacement brake light can be purchased at an Auto Parts store like Pep Boys.
The brake lights and the tail lights are separate circuits. Check the brake light fuse, then check the brake light bulbs, then check the brake light switch.
Above the brake pedal. If your main brake lights dont work but your third center brake light does, then the brake light switch is not the problem. Its is the turn signal switch.
I hate to ask , but did you check the bulbs ? The tail light portion may work fine , but the brake lights don't if both of the bulbs are bad .
a blown bulb or loose wire.
Check the switch. It has a different one than the regular brake lights. the light bulb could possibly be blown
Check the bulbs - they are double filamented- smaller for stop and larger for tailights
my back brake lights don't work, but the brake light on the back door does what could be wrong
first check brake light fuse second check light bulbs,they should be double element third check the brake light switch located on the brake pedal