Re: 5000 brake booster (servo)

[barry@olympus.ctron.com (Barry P. Lewis)]

>>Hey, here's a stupid idea.  In fact, this isn't really me typing this.  But
>>is it
>>possible/practical/desirable to replace the hydraulic brake booster with
>>a pneumatic (vacuum) one?  I'd guess that the pneumatic parts and set-up to
>>use would 
>>be from a late model C2 car (i.e., an 81-82 5000).  Do the parts fit? What abo>>ut
>>the left over hydraulic plumbing? Anyone ever try this?  Anyone have
>> (or have access to) both a C2 and a C3 to see if this idea makes any >sense?
>>Somebody else pretending to be -
>>Jason Douglas

>The idle brain comes up with many strange ideas, But they are worth
>discussing:

>Watch out for vacuum ( lack of it ) problems in the turbo versions,
>since the manifold can be positively pressurized a lot during
>spirited driving. Perhaps a large accumulator ?

Does your 5000 have the mechanical vacuum pump that the 4000q uses? 
(Driven by the cam)
It seem like that would supply proper vacuum regardless of manifold pressure.

Actually, I've always wondered why that pump is there. The four cylinder cars
 don't have one. Seem like it would be useful only on a turbo car.

Anyone know?

Barry
86 4000CS Quattro