[V6-12v] stopping problems

[Elliott Potter]

Right ... they pulled that pump out and replaced it with the vacuum
reservoir.  The problem with 12v.org is that it mainly focuses on US
models, so it's a bit risky using that when discussing European models.
Eh.
--
Elliott

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

> nope, sorry
>
> FYI 12v.org does show a vacuum pump which "...is
> omitted in every model made after 1992"
>
>
> mike
>
>
> mike --- Elliott Potter <mailinglist at eep.burdell.org>
> wrote:
> > 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
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > >
> >
> ___________________________________________________________ALL-NEW
> > > > Yahoo! Messenger - all new features - even more
> > fun!
> > > >  http://uk.messenger.yahoo.com
> > > > >
> > > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> ___________________________________________________________ALL-NEW
> > Yahoo! Messenger - all new features - even more fun!
> >  http://uk.messenger.yahoo.com
> > >
> >
>
>
>
>
>
> ___________________________________________________________ALL-NEW Yahoo! Messenger - all new features - even more fun!  http://uk.messenger.yahoo.com
> _______________________________________________
> V6-12v mailing list
> V6-12v at audifans.com
> http://www.audifans.com/mailman/listinfo/v6-12v
>