Vacuum diagram 3.2 7L 2004 touareg - 2004 Volkswagen Touareg

I would go to the data bus first. No easy fix for this. You need a scanner( not a code reader) to trace this down. You also need wiring schematics and pin outs for the plugs. And a volt/ohm meter. after that issue is fixed. If you still have the booster problem, replace the vacuum pump.

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Hi. the owners manual has a detailed set of instuctions.

i had the same problem would drive for about 2mins and the engine to my VW2004 touareg will stop running i would turn it back on and it will start running. took it to VW was told it was fuel pump . i had that fixed and couple of weeks later the car battery won't start i had to jump start it .:::(

the timing marks for all vw/audi/seat and skoda are on the front pulleys(they are small dots)you may need to highlight them with chalk.

Check the automatic transmission fluid in your gear box.

You didn't mention engine size.
Here are links to the belt routing diagrams you will need to put the new belt on...
V6 3.2L http://www.gates.com/common/part_locator/view_diagram.cfm?id=S7046
V8 4.2L http://www.gates.com/common/part_locator/view_diagram.cfm?id=S6042

Here is a link to a video which will walk you through the replacement step by step...
http://www.wonderhowto.com/how-to/video/how-to-inspect-and-replace-your-car-s-serpentine-belt-267229/

Find the radiator fan relay and remove it. If the fan stops, source a replacement relay.

yes, you need a piston retract tool for the rear cylinders. rear piston must turn clockwise as it is being retracting.

if it occurs when you are moving it is most likley to be the propshaft centre bearing i have done a few....you cant get the bearing seperate im affraid its the whole shaft...hope this helps.