48k on original pads? That's pretty good. Rotors depends on how they have worn and how much of a lip they have. There is a minimum thickness. But I tend to replace them anyway because they tend to wear unevenly - they get grooves and ridges in them. People debate pads much more than rotors. Zimmerman rotors are popular, and will save you some money. People often say BMW pads make too much dust, but I have not found that to be true on my 6 or my X3. But there is a 535 in my family that might as well have flat black wheels. Not sure why the difference.
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