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Hi. i got brand new slotted disc brake rotors and thier already showing signs of surface rust .. Why is this? and is there any kind of coating i can use to keep them looking new and functioning properly.. ??? i suppose that when the brake pads rub up against the rotors that this will grind off some of the surface rust? hmmm
 

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That's pretty normal for rotors. Most unpainted metal parts are coated with an oil to prevent flash rust, but I would imagine because of liability issues, they don't want to do that with rotors, because some bozo won't clean them off and will end up getting a close up view of a tree some where ;)

You could give them a light coat of oil to prevent further rusting, if they're going to be sitting for a while (but be sure to clean them good with brake cleaner before using them). If they're going into use in the near future I wouldn't worry about it. After a couple of stops, they'll look good as new.
 
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