Here we will post links to Axles, Suspension and Steering related solutions. This post will be edited by an Administrator when a new solution is found either within this forum or elsewhere on the Interweb.
PARKING BRAKE
Parking Brake Fault - From one of our very first contributors, A8Doc 
.
AIR SUSPENSION
Air Suspension Lowering Tip -
Architex_mA8tey
How to remove and install a D3 Air Suspension Compressor - GlynC
Adaptive Air Suspension - Full Audi Guide PDF - Richardracer
Modified VCDS labels for D3 suspension - Delboy
suspension gone harsh since battery disconnect - mechanico lee
Power Steering Hose Failure & Fix - D3 S8 - Delboy
DIY - Replacing Headlight Level Sensor - Leorio
WHEEL BEARING
Video - How to Replace a D3 Rear Wheel Hub Bearing - Youtube
BRAKES
Disk and Pad options - MatthewH
Rear Brake Caliper System Rebuild - MatthewH
Remember, if you find a solution to a problem you've had or others have posted on the web let an Admin know (PM or email) and we will add it to this sticky.
__________________
Conan (the Librarian)
Watch it if you dare
Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.
Previously
2003 C5 A6 1.9TDI FWD - Loaner from
D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light.