Is braking performance compromised or are we just talking about aesthetics?
Brake rotors are cast iron and the working surfaces (in contact with the pads) are always going to be bare, no corrosion inhibiting coating. So there's no way to stop the rust from forming. The surface rust is completely normal after some time, even a day or two in a wet environment.
It should be wiped away almost immediately once the car is driven, regardless of the pad type. If it's not and excessive rust and pitting remains after a drive, suspect that the brakes are not working correctly; that a caliper piston is stuck or slide mechanism is binding.
2004 V70 +manual transmission - that's just about peak-Volvo! (IMO)
Have a good one,
Will
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XC60 / Odyssey
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