Ok, im 99.9% sure on this but of course need input, my car drives good (aside from needing new front struts) when i hit the brakes lightly the whole car shakes and the feels like im in an earthquake. when i hit them hard its less but then i shutter to a stop, when i got the car the guy said the brakes were new, and the roters looked brand new, but then after driving it aorund for a few days this started, some days are worse than others, im thinking warped rotors.