Sounds like you have a bad turn signal switch.
If the third brake light is working than we know the fuse is good and the switch is good. The third brake light bypasses the turn signal switch. If the rear turn signals are working than we also know that the wiring from the switch to the rear bulbs is also good. The brake lights and the turn signals are on the same bulb so the turn signal switch is what determines if the bulb gets power from the brake light switch or from the turn signal flasher. If the switch is bad usually the first thing that stops working is the brake lights.
Typically you can wiggle, jiggle, pull, push on the switch lever with you foot on the brake and get the brake lights to work. Sometimes turning the four way on and off several times will also get the brake lights to work. If this is the case than a new turn signal switch will solve you problem.
If you have any questions let me know!
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
SOURCE: BREAK LIGHTS
did you try changing bulbs even though your turn and flashers work these are dual-element bulbs with the brake being on separate element hope this helps
SOURCE: 96 Chevy 4x4 Break lights don't work and fuse is good
Have you checked the brake light switch under the brake pedal? It may be out of alignment with the pedal lever or dislodged from it's connector. If it is still in the right position, check if pedal travel compresses the switch, if not adjust it so it does. If everything is in order and it still doesn't work, replace the switch. Hope this helps. Best wishes.
SOURCE: Tail break lights don't work. Window break light does work however. Bulbs have been replaced.
Check the brake light fuse. The high mounted brake light (third brake light) is on a different circuit than the brake lights. Hope this helps.
SOURCE: all fuses are good, lights bulbs are new whats wrong? but tail light work
check the break light switch it is should be at the top of the brake pedal you can unplug it and jump plug with a paper clip to test if lights work switch is bad
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