[1988 90Q MT]Assembly on driver's side of cyl. head

[Huw Powell]

it's a pump to augment the manifold vacuum source for the brake assist.

James Wagner wrote:
> 
> Apologies for making two posts so rapidly, but I have another question.  In
> searching for vacuum leaks to cure my idle speed problem, I see an assembly
> bolted to the Driver's side of the cylinder head with a manifold vacuum hose
> attached.  I can't find a single reference to this "thing" in the Bentley
> manual, and it doesn't appear on the vacuum diagrams (unless I'm blind or
> stupid - very possible).  I'd like to check it for vacuum leaks, but I don't
> dare disconnect it until I know what the consequences are.
> 
> Thanks in advance,
> 
> Jim
> 
> 1988 Audi 90 Quattro, 198,000 miles (VIN W.AU.H.C.0.89.4.J.A.235703)

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/