Overview If you have a D2 A8 with a 40 valve motor and are reading this, you will need to replace your braided vacuum hoses if you haven't already. My 8 year old S8 with 84K miles had vacuum hoses that crumbled in my hands. The good news is that it is cheap and easy. An hour and $15.00 is probably all that you will need.
Tools and Supplies Required
15 Feet of 5/32" Vacuum Hose - Get at any parts store (you'll have left over)
Something to cut the Vacuum Hose
Regular and Phillips Head Screwdriver
This procedure is self explanatory. You will need to remove the engine beauty covers, the air intake from the air box to the throttle plate to get access to hose number 1, and also the cold air intake going into the air box. But other than that, just follow the pictures. I worked in the order of the hose numbers below.