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The tail light/brake light bulb has two filaments. If one of the filaments is broken, you will get either only tail lights, or brake lights. If a new bulb doesn't work, then you have a broken wire or bad connection in your plug-in.

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Q: What is the problem if you have tail lights but only one brake light?
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Brake lights don't work when the brake is pushed. Work with headlights on only.?

The brake lights and the tail lights are separate circuits. Check the brake light fuse, then check the brake light bulbs, then check the brake light switch.

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i have the same problem i replaced the coolant temp sensor to get my check engine light to go off but it could be a number of things the brake light means you have a problem with the brake system but i have hared that the light sticks and is a common problem with blazers in the late eighties and early nineties models

Why does your tail lights only work when you press on the brake?

Are you saying your tail lights themselves do not work and only the brake lights work. If that is the case, check the fuse, and then check the tail light bulbs.

What could be wrong with your car if the brake lights work when the lights are off but when the lights are turned on the passenger side tail lights and brake lights completely go out?

This is usually a grounding problem. Either an insufficient ground to the assy or a positive to ground problem. As you mention the brake lights work with the lights off, it will probably be related to a problem with the "running lights" system. As you mention only a problem with the passenger rear, I would check for a poor ground related to that light assy or possibly one of the bulbs' internal filaments in that assy touching each other. Or possibly a socket failure at that assy. Good Luck

Why does the brake light not light up when you turn on the light but it light when you brake?

This is operating as intended. Brake lights are only activated when the brake pedal is pressed, irrespective of the other lights in use. It is a safety feature so vehicles behind are aware the brakes have been applied. They are separate from the tail lights so they still give a visual indication of braking whether the other lights are on or off.

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What would cause the brake lights to stay on in a 1995 villager?

I have a 98 Villager and I had the same problem. I found that the brake light switch at the brake pedal needed adjusting. Just loosen the lock nut and adjust the switch so that the brake lights do not stay on but only come on when the brakes are applied, then tighten the locknut. Worked for me. Hope this helps.