brake lights are out but the third one worksd
If that doesn't solve the problem it could be the turn signal switch. Power for the outboard brake lights goes through the turn signal switch. But the third brake light is wired directly to the brake light switch. HTH. -Jim
It's the four way switch I have av99 Chevy luminaries I had the same problem got the switch change and it works great
Looking for a Used Lumina in your area?
CarGurus has 218 nationwide Lumina listings and the tools to find you a great deal.
Search Chevrolet Lumina Questions
Chevrolet Lumina Experts