[urq] Cruise control

Brandon Rogers brogers at terrix.com
Fri Jul 8 15:26:22 EDT 2005

I'm not sure what you mean by "manually compressing the vacuum motor" could 
you please clarify.

If I ground the line to the vac pump and make it run - will it cause the 
diphragm to compress?

I did the tests on the vacuum motor per Bentley and it did pass - ie it ran 
when grounded and the vent valve clicked when grounded.  I do have another 
vac pump that I installed a while back (and took back out) that did not make 
the CC operable.  I can test it too.

Thanks for the help


----- Original Message ----- 
From: "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>
To: "Urq List" <urq at audifans.com>
Sent: Friday, July 08, 2005 12:44 PM
Subject: RE: [urq] Cruise control

Yes and Yes ...

... the proper test is to pull the vacuum line from the CC pump and
apply suction there ... and you can do this by manually compressing the
vacuum motor or by using an external vacuum pump ...

... if anything the dual filament bulb holders help ... you've got two
more high current filaments in parallel to ground ... and the aux ground
strap would help mediate any resistance in the ground path proper ...

I don't remember from your original post ... have you tried a known good
vacuum pump?

Steve B
San Jose, CA (USA)
> So you're saying if the brake/clutch vent valves were not properly
> then the CC diaphragm would not stay compressed if I were to manually
> compress it?  Per Bentley I unhooked the vacuum line to the pump and
> compressed the diaphragm, and capped the open tube with my finger, the
> diaphragm did not expand back to normal.
> Will the dual bulb holders (rear brake lights) affect anything here?
I did
> also add a ground strap for each side.

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