Re: How can you tell if "the bomb" is bad?

[audistuff@juno.com (Paul R Anderson)]

I seem to recall that GM used some hydraulic brake assist on diesels.
I put an engine in a 78 Olds and I think it had hydraulic boost.  The
other option on those was to have a vaccuum pump in place of the
distributor.
(Just rambling)


Paul Anderson:Please send any direct mail to my private address as I
don't
keep up with the list very well.
 Private email AndersonPaul@juno.com


On Thu, 19 Mar 1998 13:37:54 -0800  frankbauer@thevine.net writes:
>some ignorant putz sez:     =8)
>>Please forgive my ignorance -- I'm a mechanical putz.
>>Does this apply to all cars -- or just Quattros?  I get 2-3 pumps on 
>my
>>Grand Cherrokee (don't buy these cars) -- does this mean that this 
>vehicle
>>has a bad bomb or just a very small bomb?
>
>most cars use vaccuum assist for brake boost.  the vac reservoir is a
>large round object mounted on the firewall behind the brake master
>cylinder.  vac is provided by the engine.  forced induction engines 
>(such
>as audi turbos) are not producing vacuum while running under boost (by
>definition.)  therefore you could have a situation where you need 
>brake
>assist while running under boost.  this led audi to design a hydraulic
>brake assist.  the power steering pump was replaced by what is
>essentially two pumps on one shaft, one for power steering and one 
>that
>provides pressurised hydraulic fluid to a pressure accumulator (the
>bomb) which is the reservoir used to assist braking.  i doubt your JGC
>has hydraulic brake assist.  i would hazard a guess that nearly all
>turbo quattros use the bomb.  likely some non turbos also use it and 
>some
>early urqs may not.
>
>frank
>
>
>

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