[V6-12v] stopping problems

[Elliott Potter]

On Mon, 2 Aug 2004, [iso-8859-1] mike wrote:

> i think you are wrong this time...my UK '93 V6 80q has
> a bomb (in the german m24 sense)....it's located
> behind the wheel arch liner on the passenger side
> front wheel

There was, for a limited run (I don't know if this made it to the US ...
anyone?), a hydraulic pressure accumulator on the power steering system
(between the oil cooler->rack line and the pump).  But it's still a
hydraulic system, and the brakes are vacuum assisted (right?).  Do you
have a vacuum pump on the back of one cylinder bank?

> it also has the two stage ps pump and runs on green
> gold

They hung on to green gold for the hydraulic system; they seem to like
it.
--
Elliott

> mike
>
>  --- Elliott Potter <mailinglist at eep.burdell.org>
> wrote:
> > I'm frequently wrong about this stuff, but I still
> > disagree:
> >
> > On Mon, 2 Aug 2004, [iso-8859-1] mike wrote:
> > > The v6 na cars have the bomb too...
> >
> > The "bomb" on 5-cylinder cars is a hydraulic
> > pressure accumulator, which
> > has three hose connections (two are 2000+ psi
> > hydraulic connectors),
> > whose function was to maintain *hydraulic* pressure.
> >  This was necessary
> > because turbo cars used a hydraulic brake boost
> > system, as opposed to a
> > vacuum assisted brake system, and the bomb (which
> > was charged with
> > high-pressure nitrogen) was there to maintain
> > hydraulic pressure to the
> > brake system.  It's called a bomb because it looks a
> > bit like the German
> > M24 and M34 ("potato masher") grenades.  I don't
> > know for sure if non-turbo
> > 5-cylinder cars had this but I don't think they did.
> >
> > Cars with the 12v V6 use a vacuum assisted brake
> > system, and do not need
> > a hydraulic pressure accumulator.  What the 12v V6
> > _does_ have is a
> > vacuum reservoir, which is a round plastic ball that
> > sits in front of
> > the intake manifold next to the ignition coil packs.
> >  It looks a bit
> > like the ACME brand bombs you see in cartoons, so I
> > guess you could call
> > it a bomb, though it's less likely to explode if
> > mistreated like the
> > turbo cars' bomb is (since it's just an empty
> > plastic ball).  The main
> > function of the vacuum reservoir is to provide
> > vacuum for the intake
> > manifold changeover valve, since that valve operates
> > at high engine RPMs
> > where the vacuum provided by the engine is reduced.
> >
> > The vacuum brake booster gets vaccum from a
> > different part of the engine
> > and is not connected to this reservoir.
> >
> > Having said all of that:
> > - the large diameter vacuum lines that feed the
> > brake booster do tend to
> >   crack, and that could cause braking issues (though
> > it's not as
> >   likely).  Those lines plug in to the front of the
> > intake manifold
> >   unless you have a very early 1992 build.
> > - the connection to the vacuum reservoir commonly
> > cracks, and the
> >   resulting vacuum leak can cause the sorts of
> > problems that vacuum
> >   leaks normally cause; generally rough running
> > and/or CELs.
> >
> > *shrug*  Like I said, I could be wrong on this.  I'm
> > not doing a very
> > good job of keeping up on 12v trivia since I don't
> > have a 12v car
> > anymore.
> > --
> > Elliott
> >
>
>
>
>
>
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