The rear hub is press-fit into the rear wheel bearing, which in turn is press-fit into the trailing arm. When replacing the rear hub, the rear wheel bearing must also be replaced since removing the hub destroys the bearing. If only the wheel bearing needs replacement, the hub can be reused unless damaged or bent. Specialized tools are essential for removal and installation since the bearing and hub are press-fit. Some tools allow hub and bearing removal and replacement without taking out the trailing arm; when using these, always follow the tool manufacturer's instructions. If using a hydraulic press, the trailing arm must be removed, and on E36 models, this necessitates an alignment check due to changes in toe alignment. The rear wheel bearings, being press-fit, cannot be serviced without damage. If they are noisy or loose, they must be replaced. Disconnect the negative battery cable, raise the vehicle, remove the wheel center cap, loosen the rear axle nut, take off the wheel assembly, and remove the halfshaft assembly. Then, remove the brake caliper and bracket assembly, ensuring no tension on the brake hose. If possible, use a slide hammer tool with a stub axle puller adapter to remove the stub axle from the trailing arm, followed by the large snapring. Next, remove the rear parking brake shoes, springs, and adjusters and the rear trailing arm. Use a hydraulic press to push out the stub axle and the bearing. If the inner bearing race remains on the stub axle, use a puller or chisel to remove it. Clean the stub axle, removing any burrs. For installation, consider freezing the bearing after placing it in a plastic bag and lightly lubricating it to ease the process. Check the trailing arm for damage, clean the area where the bearing goes, ensuring no sharp edges. Using a press, install the bearing into the trailing arm, followed by the snapring. Install any necessary dust shields, support the inner bearing race, and press the stub axle into the race. Reattach the trailing arm, ensuring alignment marks on E36 models. The remaining assembly is the reverse of removal, using a new axle nut and ensuring all fasteners are tightened. Finally, check and adjust the rear wheel alignment if needed.
Posted by BMWPartsDeal Specialist 
