what does it mean on 2004 Chevrolet Impala

what does it mean when your car shakes when you hit the brakes

Asked by for the 2004 Chevrolet Impala
It usually means the brake rotors are warped.
but i recently just got them resurfaced about 3 months ago
Actually machining rotors makes them more prone to warping. Because every time they are machined it makes them thinner reducing their ability to dissipate heat. In the shop I used to work at we routinely replaced rotors instead of machining, and we had very few come backs and/or disappointed customers.