Ever since I can remember, there is this pulsating sensation I get when I apply the brakes. Is this the ABS working in a normal case or are the rotors warped. The pulsation kinda goes away when the rotors are hot after driving hard and braking hard. Car has about 12,000 miles and has been down the quarter a few times and has seen one autoX. The car brakes really well and does not pull to either side when braking.