Vibration can be caused by many things.
Rotate tires from front to back to see if the problem moves. If so you may have a bent rim or just a bad tire.
If there is cupping on the front treads you will have to go through the front end to find bent or worn parts causing misalignment. This could be worn control arm bushings, tie rod ends, sub frame bushings or misalignment, struts, or even wheel bearings.
Vibration when braking is most often warped rotors. Always hand torque lugnuts, even insist that the shop does this.
