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first, rule out that pads were reused on new rotors. used pads, even for a short period, will have deposits on them, and will likely cause vibration under braking, especially light braking. see the stoptech site for a full explanation.
second, was a proper bedding in done? if not, then again you are dealing with deposits.
if you installed new rotors on old pads, you can try surfacing the rotors and then installing new pads.
if you installed new and new, then in addition to surfacing the rotors, you can try sanding the pads and then hashing the pads with a knife and putting a cross-hatch pattern on them
as for the control arm bushings, you have to have the car up in the air. then you can see the bushings, and look for cracked rubber. the castor blocks (rear) are pretty easy to tell if they are shot. the front bushings not so much.
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