Hi,i hav just picked up a6 2.5 tdi estate ael 140,on a 96,on giving it a service and general check notice a small vacuum pipe had snapped off on oil separator,talking to so called audi expects at garages noone seems to know what i mean,can any one enlighten me to what it does,looks like it runs to boost valve,and does hav a vacuum to it,been trying to locate another one but no joy,cheers