Most of the time the problem is in the turn signal switch. The third brake light circuit bypasses the turn signals.
Someone would need to check brake light power in and out of the turn signal switch.
SOURCE: 2003 Chevy S10 Brake lights
OK try this, push and hold brake then push on the hazard switch if brake lights come on then replace the turn signal switch.
SOURCE: lower brake lights on 92 camry wont work
YOU MAY NEED A LIGHT FAILURE SENSOR WHICH IS LOCATED IN THE TRUNK ON THE DRIVERS SIDE
SOURCE: brake lights went out, changed bulbs, checked fuse, still wont work
You have to check the brake light switch which should be around the brake pedal on the upperside.
Ones located rremove the wires tht go to the switch and jump them by using a piece of wire, thn check if the brake lights come 'on'. If they do , thn its the switch tht may need replacing or even sometimes adjusting inorder to operate.
Hope this helps.
SOURCE: 99 Chevy Tahoe... Rear turn signals, brake lights, and hazards
I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!
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