I assume you have checked/replaced the bulbs. Take a cicuit tester and check the wire harness connections under the bumper and around the trailer connector if you have one. The problem must be at that area IF all your other lights are working as you said.
either your fuse is blown or the wiring is bad
Check the brake light switch.
Check the fuse, check the bulbs and check the brake light switch, it should be one of those.
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 center high mount led brake light unit has been known to go bad.
I can't turn the yellow brake or parking lights on my 1998 Chevy blazer off and it's draining my battery.Could you please tell me which fuse or switch I'd use to disable the front yellow lights? This is happening even with the car off.
Just a suggestion, check your trailer lights harness for corrosion. They were taking the dash lights down in my chevy.
Yes they indeed have brake lights...
Brake Lights Stay on Unless the Brake Pedal is RaisedThis is usually caused by the brake light switch being out of adjustment in its physical distance to the contact point on the brake pedal arm.
Ensure relays and parking brake switch are properly functioning.
On a 1998 Chevy Blazer, the parking brake switch is located on the top of the parking brake assembly. There are 3 bolts that hold the switch to the parking brake assembly.
Check the bulbs they are double filamented -smaller for brake lights larger for tailights Check the fuse Check the stop light switch usually located at the upper end of the brake pedal under dash area