There is somthing wrong here. That truck doesn't have an inner and outer wheel bearing. It has a wheel bearing that is part of the hub assy.
Whoever did the work should show you the old ones.
This is what you said: "the truck never vibrated before changing the brakes." Therefore the wheel bearings should have nothing to do with your vibration. I think somthing wasn't done right on the brake job the first time and someone's screw up was covered up afterwards.
Monday, August 7th, 2006 AT 8:35 PM