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I've written it up here... http://samboutros.wordpress.com/2007/04/02/2003-audi-a4-bulb-replacement/ Steps, pictures and links to bulbs...
you go.... and replace it!
This question needs to be clarified. Are you referring to bulbs? Or the actual assembly?
Pull the carpeting behind the brake light. Unclip the assembly, replace bulb.
Replace the brake pads.
you unscrew the light bulb and put another one in from auto zone. There sholud also be a manual that came with the car (alternatively see if you can find it online) which should help you with the work.
open the trunk, on the side by the opening you will see a round cover, pull that cover back, that will give you access to the screw that removes the tail light assembly. remove the tail light assembly, when you pull out the tail light assembly you will have access to all of the bulbs in the tail light. this is a 5 minute job, very easy.
The 2007 Audi A6 has a V6 engine.
The 2007 Audi S8 has 40 valves.
The 2007 Audi S6 has 40 valves.
The 2007 Audi Q7 has 24 valves.
The 2007 Audi A6 has 24 valves.