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Make sure that the slide pins on the front brake calipers are not corroded and preventing the calipers from sliding freely when the brakes are applied.
(If they are, only one side of the brake pads will extend and make contact with the rotor when the brakes are applied, or the brake pads will not retract fully when the brakes are released.
This will cause the rotor to flex slightly, and will also cause the rotors to overheat if the brakes are used continuously (like going down a very long hill or mountain).
Eventualy, the rotor will warp or develop hard spots on it's surface and cause vibration when using the brakes.
I've had this problem before on the 940 series, and now it's a part of regular maintenance to check the sliding mechanism of the calipers when working on the brakes.
This is not a problem on Volvo 240's.
In my opinion,, the braking system on the 940's are lacking because it seems like I'm always having to troubleshoot brake problems.
With me living on a mountain and this being my wife's car....well you get the picture.
If you replace the rotors, buy a good quality rotor, service and re-grease the caliper pins and torque the wheel lug nuts with a torque wrench.
Just my opinion
hope this helps
steve
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