All wheel drive does not engage

[Zsolt]

Gerald,

Your car is always 4 wheel drive. You cannot disengage that. The
switch/light you are referring to is for the differential locks. If it's
not working, it is usually a vacuum leak problem.

Cheers,
  Zsolt

Gerald Penyweit wrote:

> Hi,
>
>
> My all wheel drive on my 86 Audi 5KTQ does not engage. Well the dash light
> does not come on when the switch is turned to engage the rear drive.
> Someone
> had a thread here before saying that this is usually
> a vaccum leak problem. Has anyone else experienced this problem, and did
> it turn out to be a vacuum problem?
>
>
> Thanks,
>
> gerald
>
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