S4 Oil leak, what is this part?

[Lavis89]

Hi guys, does anyone know what this part is (circled in red)?
Popped up my mates unit to have a look at my car last night and noticed a patch of oil on the ground, turns out i have quite a steady drip coming from the under side of this part. It is a little releiving because i thought my car was burning oil at quite a rate, but it's just leaking instead.... It looks like the cap comes off the front of the engine so hopefully i can just replace the seal.

 

[xpoweruk]

Should have the parts sticker on the front of it.

 

[Lavis89]

It does but i'm 30 miles away from the car at the moment hoping to not have to take a trip there just to find out what the part is.

 

[evo97]

Brake Servo Vacuum Pump

http://audi.7zap.com/en/rdw/audi+a4+avant/a4/2011-636/1/145-145008/

 

[Lavis89]

Brake Servo Vacuum Pump

http://audi.7zap.com/en/rdw/audi+a4+avant/a4/2011-636/1/145-145008/

Quick look on google and thats the one, cheers. seems to be quite a comon thing these seeping oil. Off to ebay to order a new gasket i guess!

 

[rum4mo]

This is good info, now I know what that is - mine is still nice and dry! (I never considered where the servo would get its vac from in this setup)

 

[Lavis89]

Mines got quite a decent leak going on from there! A bit of a relief to be honest, I thought the car was burning quite a bit...
Apparently it's a o-seal inside the pump that lets go. I'm going to take the end cap off and give it a go with a thin smear of red high temp silicone