Worked on an A4 1.8tq rear wheel bearing the other day.
Maybe some of ya would be interested in this if you need to do it too.....it's
not too long of a job, and I opted to pull the whole hub assembly off the car
since using a puller on there then trying to press it in would have been an
utter PITA without special tools. the only real special tool I used was a press
for putting in the new bearing. If you don't have a press, maybe you can take
the whole upright and your new bearing to a shop and they can do it for you?
I started by breaking the 14mm allen head, collar bolt, in the hub, free while
the car was on the ground. You can do it while the car is up in the air with the
wheel off, but then you need to put the parking brake on and put a lug bolt on.
After that, you can remove the two 8mm allen head bolts holding on the caliper
assembly (put parking brake on). Pull the whole brake assembly out of the way.
Remove the 3 10mm bolts for the rotor shield and take it off. Remove the ABS
sensor's 5mm head allen bolt. Spray some penetrating oil on it and with a flat
screwdriver, gently tap it in to the mating surface to make the sensor lift off.
You might want to clean the sensor up before reinstalling so it goes in smoothly
and doesn't rust to the suspension upright. After that, mark the orientation of
the lower camber bolt with it's adjustment washers. This way you probably won't
lose your alignment very much when reinstalling. Remove that lower bolt and the
upper control arm bolt, the upper stabilizer bar link bolt, and the rear
horizontal arm nut. That rear arm nut was a bit of a pain at the last threads.
You can use a clamp to keep the joint from rotating as you twist the nut off.
Close-up of bearing. note the stepped I.D.s. (facing outside of car where hub slips into it, the large I.D. is on the outside facing you)
Slipping the upright back in