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Originally Posted by BALISTC
Why do 4000s crack?? They are the same as 5000 series, except the 5000 series has a separate hat.
I cant see how they'd crack if they are used properly i.e. cooled down and warmed up correctly.
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I agree..... all new rotors should be run in slowly on the street for 200kms with street pads to temper them. If you took then straight out of the box and used them on a track day I bet they would crack 4000 or 5000
