All lights are functioning and the bulbs are good. Light started coming on a few months back and I replaced the bulb. Where the brake light twist socket attaches, the brass filament seemed a bit corroded but I've changed the entire tail light assembly to another one that is not. However, when I press the brakes the lamp out light on the cluster still comes on. Any ideas? Thanks Jim

Probably a bad bulb failure relay, one can be had for less than $50 on ebay. You can also pull it out, take it apart and fix any faulty solder joints, if you're handy with a soldering iron and into saving some coin.

That light doesn't only signify brake lights. It signifies any bulb any where on the outside of the car. Is the bulb failure light always on, like from the second you start the car? Or does it come on when you do something?

My break bulb failure light comes on only when brake peddle is depressed - so where is the bulb failure relay located at?
Thanks!
Stephen

It is located under the dash, below the instrument cluster, on the left hand side. It is mounted horizontally, it looks like a red film vial and is about the size of a "D" battery.

Thanks, yeah I know it's for more than just the brake lights but it only comes on when I press on the brake pedal. Plus as mentioned, all lights are working. Where can I find the relay?

I've replaced the whole assembly and have had the bulb warning light come on, only with the brake pedal pushed in. I had someone hold the pedal in while I rotated the bulb socket just a little bit - the light became slightly brighter and the warning light went off.

Probably wan't making a full contact. I had the same happen with my 850.

Thanks Bubba, tried that as well. All too familiar now with the connections on these volvos. Maybe I'll try that again and this time I'll use the Fonzie touch lol.

I have just the opposite happening, bulb failure light illuminated goes out when I step on the brake!

I've been using alcohol to clean the contact points for the rear lights. Is there something better?

Yeah, a wire malfunction.