DeTomaso Mailing List: May 2000, Message #171

Some of the GM cars must use one. My '84 Chevy Celebrity shop manual
shows one mounted under the battery tray on the drivers side of the car.
My Celebrity is long gone so I can't take a look. One of these pumps
should be quite reasonable from a "junk yard".
	Fred T.
Peter Menyhart wrote:
> 
> From:Peter the German
> 
> Mercedes uses one,since they operate Door locks,Climate Control,and a lot of
> other stuff with Vacuum.
> Of course its not cheap,I believe its close to 400 bucks.
> 
> Peter
> 
> ----- Original Message -----
> From: "Richard Barkley" <rbarkley@earthlink.net>
> To: "Multiple recipients of list" <detomaso@realbig.com>
> Sent: Wednesday, May 03, 2000 8:19 PM
> Subject: Electric Vacuum Booster Pump
> 
> > John Parsons mentioned yesterday in his SUPER writeup of his 'Vegas
> > track time (and in 'Vegas) that he had lost vacuum (and thus his brakes)
> > almost causing a crash on the course. I talked with someone during the
> > concourse about this and he mentioned that some diesels use an electric
> > pump that pulls something like 29" of vac - it's always there and gives
> > about twice (?) the boost.
> >
> > In the HR magazine I got today there's an add on page 66 for Master
> > Power Brakes (888-251-2353) for their AC2723K electric vacuum pump.
> > Specs are 7x6x3 inches, 5 lbs, 20" vacuum, and 3 amps. It sounds a
> > little bigger than the one described to me, but still small enough.
> >
> > So, anyone ever used such a thing? Know of any deisel (truck?) units?
> > Would something like a diesel VW use one? Is this a solution for those
> > complaining that they can't press hard enough on their brakes - I seem
> > to remember a recent Profiles (or NL) article where someone went to
> > great lengths to change the MC diameters to get more leverage. Seems
> > like this would be a better way to go (assuming the booster can handle
> it).
> >
> > BTW, I suggested to John that maybe there was a leak in his booster, its
> > check valve, or lines as there should be plenty of vacuum for at least a
> > couple of brake stabs even with no vacuum at the engine when the brakes
> > are applied.
> >
> > Richard Barkley
> >