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In looking through the archives, I found a posting regarding rebuild
kits for the auxiliary vacuum pump (for braking). How good are they?
I'd like to avoid paying $400 for a new one, but will bite the bullet if
installing a new pump is the optimal long-term solution. The archived
posting is quoted below.
>Date: Mon, 2 Feb 1998 00:13:54 EST
>Subject: Re: 85 4ksQ questions (3 part)
> That knocking sound is most likely the vacuum pump that sits on the
>the cylinder head... This pump helps intesify the manifold vacuum for
>brake booster. I can get rebuild kits for these. It makes an
>knocking sound when it does go, and it doesn't seem to affect
>pump is only on 1985+ 4000Q, 85+Cpe gt, and VW Quantum GL5s, and
>well as 80s and 90s 88+. Gee, thanks VW Audi. Audi's silly list for a
>is like $400+ of course. This thing went on both my 854kQ and my
>Cpe. It seems that the oil seal wears out, and the pump gets oil
>causing this wierd knock that can sound almost like a bearing knock.
>know if this sounds interesting....