[V8] open vacuum line

Dave Saad dsaad at icehouse.net
Wed Apr 29 20:24:35 PDT 2009

If it has not been said already, that hose (I can not see your  
pictures) goes to the cruise control fail safe switch.  If the cruise  
control were to somehow malfunction electronically (not likely but  
possible) and suck the throttle open, that vacuum switch is the only  
safety between you and that oncoming truck. If you plan to use the  
cruise control, you should make sure it works.
btw, I am pretty sure all cars have this switch. I do remember some  
story of an early Lexus that did not, and of course they had a  
failure.  I bet they do now...

Dave (who owned an Audi back in the good old days of unintended  

On Apr 27, 2009, at 6:46 PM, Ed Kellock wrote:

> No.  For manual transmission, both clutch and brake have a cruise  
> control
> switch on the pedal bracket.
> -----Original Message-----
> From: Kent McLean [mailto:kentmclean at comcast.net]
> Sent: Monday, April 27, 2009 6:44 PM
> To: 'V8-list'
> Cc: Ed Kellock
> Subject: Re: [V8] open vacuum line
> Ed Kellock wrote:
>> Yes, that is the cruise control vacuum line.  It does not connect to
>> the engien vacuum system at any point.  It goes through the firewall
>> and to the cruise control vacuum pump in the driver's side fender  
>> well
>> behind the hydraulic pump reservoir.  There is a T off of it near the
>> driver's side distributor that goes to the cruise control throttle
>> control diaphram.
>> <http://home.comcast.net/~kentmclean/audi/v8/DSCF0007.JPG>
> So in the image, should the T that is shown with an open end have  
> its open
> end plugged?
> Thanks.
> -- 
> Kent McLean
> 1999 A4 Avant, V6 Tiptronic
> 1991 200 TQA #3, with mods
> 1990 V8 w/5-speed and other mods
> gone: '91 200 TQA x2, '94 100 S Avant, '89 200 TQ "Bad Puppy"
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