Knocking noise on right back wheel of audi

Wow this one's tough without being there...it could be either one that you mentioned, does it make the sound when driving or setting still. If it sounds like it's up high like in the dash, maybe a bearing that supports the steering column. Best thing would be to get it up on a lift and turn the steering wheel and look for the sound under the car to see where it's coming from..could be the rack teeth but most likely a bearing...good luck hunting

Is the sound coming from that wheel or the other one?

Have you check your power steering system?

Check stabiliser links for wear

Bad wheel bearing. Have it changed and get an alignment to fix the problem.

yes the pins do tend to wear on these replacing them should quiet that noise.

First check the lug nuts. If they are tight it might be a wheel bearing.

lower track control arm bushes

I would check the sway bar linkages, they are usually the first to go, and they are only $40. Its an easy 'do it yourself' project, remove the old one with torches or a grinder (with a small cutting wheel). You can also use a vise grip and sockets but it takes longer.

You can't tell these are damaged until you remove the part. I change mine every 100 000km or so.

Lou,I belive your right.When an axle goes this is the sound they make.