Heres what i would do jack the front of the car up (both wheels off the ground ) remove the front suspected wheel and place two lug nuts back on to secure the rotor then have a freind put it second gear bring it up to speed then slowly apply the brake checking for the noise . Also did you jack up and checj the front end ball joints, tierods , "WHEEL BEARING" ? And I'm assuming the calipers slide bolts are Sliding free and greased ? Also have you checked your axle nut to make sure its tight. Just a few things i would recomend