I have a 2001 Dodge Stratus. Why aren't my brake lights not working?.

I take it that when you turn on the head lights, that the rear driving lights come on, correct? It's just when you hit the brakes that the extra brightness isn't happening? There should be a bulb in there with a double filament. That's why when you hit your brakes, they become brighter. It sends power to the second filament, causing the bulb to get brighter. Have you replaced those bulbs?

but when the headlights aren't on during the day the brake lights don't work at all

But do the tail lights themselves light up at night? I know the brake lights aren't coming on. Here's a video that might explain it better. https://www.youtube.com/watch?v=7gWQgpDL-FY Did you see when he hit the brakes how one side got brighter? The other side remained dim. That's because his double filament bulb was bad on the passenger side. Do you have tail lights when the head lights are on? If your middle light is out, I heard that will cause your lower tail lights not to work also. Notice in the video his middle tail light was working?

It's the multifunction switch turn signal switch th r brake lights goes through the turn signal switch my strstis is just the opposite of yours turn head lights on and tail lights come on but no brake lights turn head lights off and I have brake lights