Steering knuckles connect the bearings and wheel hubs of your vehicle to the suspension and steering system . allowing your vehicle to move and turn. A Loaded steering knuckle comes with all these parts conveniently pre-assembled . cutting out the need for a dangerous and expensive shop press. Damage to any one of these parts can compromise the entire wheel assembly . cause uneven wear on tires . compromise brake performance . and even cause a ball joint to snap suddenly.