To change the lubricant, loosen the wheel bolts and, after hanging the front of the car, remove the wheels. Having unbent the petals of the locking plates, unscrew the brake caliper mounting bolts, remove the caliper and take it to the side without disconnecting the fluid supply hoses so that air and dirt do not enter the hydraulic drive system. In this case, the caliper should not hang on the pipelines. Puller 67.7801.9514 or mandrel type screwdriver and hammer remove the front wheel hub cap. Loosen the adjusting nut and remove the washer. Using a universal puller A.40005/1/9 B, remove the hub assembly with the brake disc, outer bearing and oil seal. Carefully, so as not to damage the oil seal, remove the hub from the steering knuckle. Rinse the inner cavity of the hub and bearings with kerosene. Before installation, fill the bearing cages with Litol-24 grease. Fill the space between the outer rings of the bearings along the inner surface of the hub with the same grease in the amount of 40 g, and put 25 g of grease into the hub cap before installing it. Then, carefully, so as not to damage the oil seal, install the hub assembly with the brake disc on the pivot of the steering knuckle, then the outer bearing inner race, washer and wrap a new or used, but on a different car, nut. Adjust bearing clearance as previously described.