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Discs, (rotors) are made of a relatively soft material as this makes the brakes more effective...........they are supposed to wear...........not like in the "old days" when they were as "hard as iron"
Depending on your driving conditions timely replacement of the rotors is not a bad thing to do and should be considered as preventative maintenance............ they are not (relatively) that expensive......... but it's a BMW so nothing is cheap
Just ask to see the wear marks on the rotors if you are suspicious
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