New brake pads sounds like some recent brake work? The rotors should be resurfaced when the pads are replaced. Most tour rotors are too far worn to resurface, so replacement is the only option. The rotors probably need to be turned or replaced. If the "chip" is not on the surface touching the pads, it wont cause the shaking you described. If the brake mechanic used an impact wrench and over tightened your wheel lugs, the rotors could have warped. Brand new pads usually get stronger after a few drives, but should stop smoothly. You can check the rear brakes by doing a few test stops using just the hand brake.
