On rear wheel drive it is best to loosen the wheel bolts, elevate the front of the car and sturdily set the vehicle on jackstand before taking the wheel off, making sure that the truck is supported at the frame level. Then loosen the dust cap with a sharp chisel or any other appropriate equipment and pull it off at the place of removing the brake disc. Relax the locking bolt on the clamp fitting hub nut and unwind the nut. Pull the hub partially and pressed it back in order to extract the outer bearing and after that extracted the hub assembly of the spindle. To service, including your ABS wheel speed sensor, tap out the inner wheel bearing and grease seal from the hub, but you must notice that the tone-ring is built in with the grease seal and requires replacement. Pack the bearings with high temperature quality front wheel bearing grease and be sure to rub the grease into the bearings. Apply grease to the spindle and other contact bearing surfaces, coated the inside wall of that part heavily, and slide the inner bearing into the behind of the hub and add more grease to it. Fit a new grease seal Tap into place in a conical fashion ensuring even until level with the hub taking care not to dislodge any wheel speed sensors. To install, place the hub assembly onto the spindle, slide the outer bearing inside, and screw the clamping hub nut firmly into place finger tight. Spin the hub, clamping the spindle nut between needlenose pliers, and repeat this a number of times to firmly install the bearings and to clean out the excess grease. To adjust, undo the locking bolt of the nut on the clamping hub, remove any excess grease on the hub and bearings, and attach the clamping hub nut only to the smallest degree so as to attain the lowest possible wheel bearing play. Determine the accumulation of play between the surface of the spindle and the surface of the hub with a dial indicator and define it to be within defined limits. When the correct play has been attained tighten the locking bolt on the clamping hub nut to the correct torque, re-examine and adjust where appropriate. Fit dust cap, brake disc and caliper in the reverse order, and then fit the wheel and tighten the bolts, before lowering the vehicle and torque the wheel bolts in place. In 4MATIC models, front wheel bearings and hubs are inaccessible units, which are replaced in case of failure, and thus not an MOC because it involves using instruments and knowledge that only a professional mechanic has.