4000 cs differential locks malfuctions

[Huw Powell]

JONATHAN WOLOVICH wrote:
> Huw
>  
> Thank you for your answer.
> I always read your comments.
> The quattro tip was very good. I assumed (wrong)the system was 2wd 4wd 
> and 4 low.

> How do I know if  lock differentials are locked or not.

If the rear is locked, the rear tires should "scrub" in a tight turn on 
dry pavement.  Also, if you jack up the rear end and turn one tire, the 
other will turn in the same direction (corrections anyone?).

If the center diff is locked as well, you won't be able to turn the rear 
wheels with both in the air.

> I notice in the control panel  a light green came on when, I manually 
> shift the real differential divise.
> How Should the light be? On or off.

That I don't know/remember, although I *think* the light indicates a 
"locked" situation - whether it gets feedback from the servo or just 
records the switch position, again, I don't know.

> Is there a way to test the system?
> Injecting air will work?

If you trace the vacuum lines you ought to be able to test things by 
opening up connections and applying appropriate vacuum in places.  I 
think it's all vacuum, no pressure.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/