Volvoreens. I have an on going battle with my wife's '95 940 front brakes. When they heat up especially when the car is loaded with passengers, prior to stopping they pulsate and make like a grinding noise with a thumping also. I replaced the rotors it got a little better but still the same results. In the Summer it was worse, due to the heat. Maybe if we move to Alaska this would alleviate the problem. I was thinking it could be the bearing hub, but I don't want to just change it, with out being sure because they are pricey. I also changed the struts, the right bearing, uppr strut bearing about a year ago, but the problem sounds and feels like its coming from the drivers side. Thank you.

Pulsing is a good indicator that one pad is not backing off the rotor and unevenly overheating it. You can keep changing the rotors and before long, the problem will return.

Make sure that your calipers are moving freely. Not sure of the type on that model, but if they have the outter section moving on pins, the pins may be corroded. This will happen if the rubber boots protecting them go bad or stick.
Cleaning up the pins will make them work for a while, but may need to be replaced and the holes in the calipers finished up.

Another problem could be that the caliper pistons are corroded and sticking. These to can be cleaned up with fine emry paper. You must be careful with the rubber boots and keep everything very clean. I would then flush your brake system (water in the fluid could have been the problem). This may only be a temporary fix, depending upon how corroded they are, and hopefully you will have not have leak around the pistion.

In either case, to be assured of longevity, the better thing to do is to replace the calipers or have them reconditioned by a reputable shop.

We have also been having ongoing front brake problems with our 95 940T. We replaced the rotors a couple of times, but I know think this was only part of the problem. Even the new rotors would pulse a bit. Replacing the strut rod bushings seems to have helped - if only we could stop the squealing.