GMC 25850470 Steering Knuckle Assembly

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Firstly, loosen the wheel lug nuts and then lift up the car using the jack. Take off the wheel and remove the drive axle/hub nut if working on a 4WD model. Place a large pry bar across two of the wheel studs or insert a big screwdriver through the middle part of brake caliper into disc cooling vanes to avoid spinning of hub while undoing nut. Lift slightly by using a floor jack or similar device to support lower control arm in case models comes equipped with torsion bar suspension. Remove brake caliper and its disc, then hang them over on some wire without breaking brake hose as it may still be attached. Detach hub with bearing assembly together with disc splash shield from steering knuckle. Unscrew brake hose bracket from topmost part of steering knuckle, disconnect tie rod end from steering knuckle along with upper and lower arms for which this must be done too. For reinstallation, follow above procedure in reverse ensuring that torques to tighten hub & bearing assembly, ball joint, and tie rod fasteners are met. Set torque specifications when tightening caliper mounting bolts and drive axle/hub nut (for 4WD). Finally, tighten lug nuts according to torque specification for wheels.

Support the lower control arm with a floor jack and raise the jack slightly.

Reverse the removal steps, ensuring that the hub and bearing assembly, balljoint, and tie-rod end fasteners are tightened to the torque specifications. Also, tighten the caliper mounting bolts to the torque specifications, and the driveaxle/hub nut to the torque specifications (4WD models). Finally, tighten the wheel lug nuts to the torque specifications.