Is the Cruise Control Servo/Regualtor Bad?

[Cade Carvell]

I took the vaccum hose off the Cruise control servo thing, and
contracted the diaphragm, put my finger over the end of the hose.  The
diaphragm held for 1 minute, till I took my finger off.  So that appears
to hold the diaphragm fine.

Thanks,


Cade Carvell
National Business Systems, Inc.
Eagan, MN 55121
Office: 651-994-4400

>>> "Michael Riebs / Audi V8" <AudiV8 at 1stchoicegranite.com> 09/11/02
10:50AM >>>
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
>
>
>