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HELP!!!

I recently purchased a set of slotted/drilled rotors from R1Concepts and the rear is making a gringing noise. R1 claims that the rotors need to be broken in! Never heard of such a thing! They also told me to use a shorter pad on the rear. That didn't work...Anyway, does anyone recommend a specific manufacturer for w203 performance rotors? Also, will squeal paste help?
 

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It is alot of times normal for some aftermarket crossdrilled or slotted rotors to make kinda a zipping noise when you hit the brakes. If it seems like something more than that, then who knows what. I don't think brake paste will do anything. You can always upgrade to the newer factory sport rotors and calipers, but that can be rather pricey.
 
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