[V6-12v] stopping problems

[Elliott Potter]

Man, that's totally weird.  I don't know of any non-vac brake setups in
the US, but then (as I'm sure I mentioned) I don't know lots of stuff.

Ya learn something new every day.  You don't happen to have shop manuals
for that car, do you?
--
Elliott

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

> nope....two stage ps pump...one for ps, the other for
> brakes, accumulator on the brake circuit only,
> steering is direct off the pump, no vacuum pump and no
> vacuum assist
>
> But, as i said, it's a uk car....they might well be
> different in the us
>
> mike
>
>  --- Elliott Potter <mailinglist at eep.burdell.org>
> wrote:
> > 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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