Is the Cruise Control Servo/Regualtor Bad?

[Michael Riebs / Audi V8]

Have you checked the linkage that connects to the diaphragm? The little
plastic doohickey on the linkage arm goes bad, and breaks, so the diaphragm
doesn't contract anymore.

Michael L. Riebs
Grand Rapids, Michigan

'90 V8Q
'98 A6QA

www.1stchoicegranite.com

----- Original Message -----
From: "Cade Carvell" <ccarvell at nbsusa.com>
To: <quattro at audifans.com>
Sent: Wednesday, September 11, 2002 10:53 AM
Subject: Is the Cruise Control Servo/Regualtor Bad?


> Hi,
>   I am still getting the hang of Audi.  While I am waiting for my
> manual to arrive, could some one tell me if what I did proves that the
> Cruise control servo is bad.  The problem, is well, it doesn't engage at
> all.
>   I unhooked the Cruise control servo/reg harness (three wire harness)
> from the module.  I took a pair of 12V leads and touched the Top and the
> left pins.  This caused the motor to run.  I took the Vaccum lead from
> the Cruise diagphram, and attached it directly to the port on the cruise
> servo/reg.  So it was now stright from the port to the tube, to an open
> end.
>   While having the motor run, I noticed that I recieved no vaccum on
> the end of the hose.  It wouldn't even hold a piece of paper up ( a
> small scrap).  I would then surmise that the vaccum pump is bad,
> therefore needs to be replaced.
>
>   Is this correct, or does this pump run a lower then 12V current?  Is
> there some other test I should do, to make sure before replacing that
> this is really bad.
>
> Sorry for the long post, Just trying to make sure I get all the details
> correct.
>
> 1987 Audi Qauttro 4000, 62,000 miles
>
> Thanks,
>
>
>
> Cade Carvell
> National Business Systems, Inc.
> Eagan, MN 55121
> Office: 651-994-4400
>
>
>