Short in the wiring, brake light assembly, or possibly a defective brake light switch.
Brake light failure happens from a variety of problems, such as burned out bulbs, a short in the headlight wiring or a blown fuse. You can tell if the bulbs are out by a rapidly blinking turn indicator, a blown fuse by checking the fuse is the panel on the side of the dash, and check if its a short circuit by using a volt reader in the light socket.
Fuse for the "Third" Brake LightAlthough I have no experience with the Chevy Tahoe, the systems are similar for almost all vehicles.The third brake light is tied into the wiring for the other brake lights and is protected by the SAME fuse they are.Thus, there is no separate fuse for the third brake light.Therefore, IF your other brake lights are working, then a failure of the third brake light to activate IS NOT caused by a fuse, but instead an "open circuit" condition in the "dedicated" third brakelight wiring [from where its wire "splits" off of the wiring harness to the other brake lights].This is usually caused by a connector which has become disconnected, or a cut or broken wire.
Depends on what the problem is. It is either, defective bulbs, brake light switch, blown fuse, or wiring problem. Check the fuse first, then if all lights including the 3rd light are not working, suspect a defective or out of adjustment brake light switch. The switch is located somewhere on the brake pedal arm, or may be a pressure switch on the master cylinder.
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