its not a warped rotor. most likely you got some pad desposit on your rotor and it chatters every time it goes over it. is there any dark spots on your front rotors. did you do any aggressive braking recently or had the car on the track without cooling down?
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"It gave you amazing satisfaction, but anyone who says he loved it is either a liar or he wasn't going fast enough." - Jackie Stewart on racing at the Nurburgring
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