either dimmer switch or blown fuse
If you are saying that the tail brake lights are working but the third brake light is not....It may be a defective turn signal switch in the steering column.
How do you install a turn signal switch on a 1998 Chevy Tahoe?
Yes they indeed have brake lights...
For the front or rear turn signal?
If the warning lights go off in a Chevy Tahoe, it indicates a problem. In order to reset these lights the problem must be solved.
Check your fuses.
The turn signal relay on a 2001 Chevy Tahoe is located behind the lower dashboard on the driver's side. It is just to the left of the cigarette lighter.
The fuse for the dash lights on a 2002 Chevy Tahoe is in the fuse box in the interior of the vehicle. There is also a fuse for this in the engine compartment on top of the battery. This fuse is for the speedometer and odometer lights.
A blown fuse can make your dashboard lights to not work in your 1993 Chevy Blazer Tahoe. A burned out bulb can also cause this.
broken turn signal switch assemblyreplace it