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We discussed this issue with Cool Carbon and were informed that they were in fact contacted regarding this issue and exchanged multiple emails to help the customer.
CC was advised that the customers local race shop believed the issue to be warped rotors. Customer also mentioned that he had a similar but lighter vibration his previous track day with the stock pads. In order to save the customer the expense of purchasing new rotors unnecessarily, CC advised a number of things to check first including the possibility of improper bedding and pad print deposits. Daily driving generally may not be sufficient to remove pad deposits if that actually was the cause. Re-bedding can often correct the situation.
Customer had advised CC that he did not clean or machine the old rotors before bedding and that the ABS may have triggered during bedding as it was raining heavily during the bedding process. He advised CC that he would scrub the rotors or machine them to remove any possibility of material transfer prior to purchasing new rotors.
Proper bedding is intended to raise the temperature of the pad and rotor surface to a level at which a uniform transfer of material of friction material to rotor surface can occur. Activation of the ABS during this process is not recommended. It is also not advised to attempt bedding during heavy rain as it could be difficult to maintain necessary material transfer temperatures.
CC did not know the outcome of these suggestions as the customer advised later the same day of the original inquiry that he had found what he believed was a great deal on PFC rotors and pads and went ahead and purchased these. Also please note that a full car set for an E90 M3 is $230 at full retail not $400.
Hope this sheds some light on the conversation and what may have caused the bad luck.
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