The car shuttering when braking is usually from a warped or distorted rotor. It can also be caused from a wheel bearing that is severely out of round. I have seen on some cars if the pads/rotors are replaced with aftermarket parts that do not meet manufacturer specifications even though they may appear the same.
The easiest way to determine what the issue is would be to measure (or have a shop measure) the runout of the rotor and the runout on the hub using a dial indicator..
〉 Answered on Mar 24th, 2014 by Helaine Kurot, Owner/Technician at 360 Automotive