Jeep Liberty Front Licence Plate Holder #55255994ac Knocking From Front Wheel Of Jeep Liberty?

Knocking from front wheel of jeep liberty? - jeep liberty front licence plate holder #55255994ac

My mother has a Jeep Liberty 2003rd She had changed the front brakes a few months ago. Several weeks ago, suddenly began the passenger wheel. This happens all the time, but often, regardless of speed or road type. Call always the brake. Volume Automotive in high school and changed my brakes .. but I was in school .. I took off the tires and looked, but nothing seemed to be broken or loose ... All ideas, what is the shock?