Start by taking off the rear brake drum or disc. With disc brake models, the lever is removed off the cover ring on the rear of the hub. A flat-bladed screwdriver is used to pry the oil seal out of the back of the hub, keeping track of the way it was installed. Take the bearing away of the drum or disc inside, and make the hub and tap the outer bearing race out of position with a hammer and a punch. Invert the drum or disc, and tap the inner bearing outer race also. Wipe the hub and clean all dirt and grease and polish any burrs or raised spots that may prevent reassembly. Check the hub surface and look at the cracks or wear and change it. Whenever the bearings and oil seal are disturbed, always replace it and the outer races are usually damaged. Get a new set of bearings, an oil seal, and a little amount of special grease, at a VW dealer or used parts shop. When reassembling, a light coat of clean engine oil must be applied to the outside of each bearing race to make it easy to fit in place. Clamp the hub and find the outer bearing outer race, and fully tap it in place using an appropriate tubular spacer that will only touch the outermost race edge. Again turn the drum or disc over and in the same way fit the inner bearing outer race in position, taking a care to get both outer races properly in place and clean. Grease both tapered roller bearings with work and grease outer race before applying a smear on the outside race and then install tapered roller bearing on the outer race of inner bearing. Press the oil seal at the back of the hub with the sealing lip inwards, and until flush with the back of the hub, with a suitable tubular drift as required. In the disc brake models, the new cover ring is pressed all the way on the back of the hub. Lastly, invert the drum or disc, attach the tapered roller bearing to the outer race and attach the toothed washer and then replace the brake drum or disc.