The main brake lights aren’t working but the tail lights are. As well as the 3rd brake light. So far I’ve checked fuses, break switch and that the bulls have power. I feel like I’ve tried everything! What could be the problem

 

You said you checked the brake switch, but did you check the thing that activates the brake switch when the pedal is pressed? Common failure on 90's integras and probably civics. I had to superglue a penny on the tab to fix it.

 

Also a continuity check from the brake light socket to the brake switch. As well as the ground(s) in the rear the brake lights utilize. You say you check if the bulbs have power but not sure exactly what you did for that thus my continuity comment.

 

Are you sure its not a dual filament bulb and the brake filament diddnt go out? My civic recently did this, the tail lights come on but when i applied the brakes there was no extra light. It was the bulb like I mentioned.

 

Good catch, I misread considerably. Thanks for catching this. It should definitely be a dual filament bulb. It can also be a continuity problem on the brake light wire. They tend to be a 3 wire setup.

Almost everything in Honda is ground activated so I wonder if the brake/tail lights are the same way, switched ground and it has 1 hot wire. I'll have to look at the electrical diagrams before I can say with confidence.

 

yeah, if your 3rd brakelight is working than the bulb must be wrong.

 

Yes I would check for continuity next if the new bulb doesn't work! I do believe its a 3 wire setup on the brakes lights but dont take my word for it..