Home » Public Forums » GMCnet » [GMCnet] Power Brake Booster
| [GMCnet] Power Brake Booster [message #92667] |
Tue, 20 July 2010 10:42  |
James Hupy
Messages: 6806
Registered: May 2010
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Brake booster question. When I was looking at Gary Berry's Master Cylinder
last night in the Kmart Parking lot in Salem, I noticed that his Booster had
two anti-backfire valves in the booster that were connected to a short piece
of hose w/a T in the middle to connect to a Vacuum source. Hadn't run across
one exactly like this one. Anyone know what it might be off of?
Jim Hupy
Salem, Or
78 Royale 403
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| Re: [GMCnet] Power Brake Booster [message #92705 is a reply to message #92667] |
Tue, 20 July 2010 13:45  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
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I have seen those two check valve boosters before. I think they were designed for applications with two vacuum sources such as the engine and an external pump. I've never seen them "T" in an original installation and I can't see any benefit to that. Sounds like it is an adaptation of a dual input booster to a single input source.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Power Brake Booster [message #92740 is a reply to message #92709] |
Tue, 20 July 2010 19:27 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
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Netters
Is the booster on the GMC specific to GMC or are other applications
available that will work?
Got a notice from Cardone that they have been rebuilding certain
boosters.....
Thanks
Mike in NS
On Tue, Jul 20, 2010 at 4:17 PM, James Hupy <jamesh1296@gmail.com> wrote:
> It seems to me back in the dim reaches of my memory, that some of the high
> performance 390 cu in Cadillac engines of the late 50's & early 60's that
> had 10.25 : 1 Compression and long timed camshafts had a vacuum booster
> resevoir near the firewall, looked like a cylinder of welding gas. They had
> PB boosters that had more than one check valve, but the booster cannister
> was considerably thicker front to rear. The GMC application had the normal
> thickness and bracket and MC. Perhaps some mixing and matching of booster
> parts?
> Kinda looks to me like a convenient way to plumb in an aux. vacuum pump.
>
> On Tue, Jul 20, 2010 at 11:45 AM, Bob de Kruyff <NEXT2POOL@aol.com> wrote:
>
> >
> >
> > I have seen those two check valve boosters before. I think they were
> > designed for applications with two vacuum sources such as the engine and
> an
> > external pump. I've never seen them "T" in an original installation and I
> > can't see any benefit to that. Sounds like it is an adaptation of a dual
> > input booster to a single input source.
> > --
> > Bob de Kruyff
> > 78 Eleganza
> > Chandler, AZ
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
> _______________________________________________
> GMCnet mailing list
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> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
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| Re: [GMCnet] Power Brake Booster [message #92747 is a reply to message #92740] |
Tue, 20 July 2010 20:33 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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There are others that will work, Jim Bounds has one.
On Tue, Jul 20, 2010 at 5:27 PM, Kingsley Coach <kingsleygmc@gmail.com>wrote:
> Netters
> Is the booster on the GMC specific to GMC or are other applications
> available that will work?
> Got a notice from Cardone that they have been rebuilding certain
> boosters.....
>
> Thanks
> Mike in NS
>
>
>
> On Tue, Jul 20, 2010 at 4:17 PM, James Hupy <jamesh1296@gmail.com> wrote:
>
> > It seems to me back in the dim reaches of my memory, that some of the
> high
> > performance 390 cu in Cadillac engines of the late 50's & early 60's that
> > had 10.25 : 1 Compression and long timed camshafts had a vacuum booster
> > resevoir near the firewall, looked like a cylinder of welding gas. They
> had
> > PB boosters that had more than one check valve, but the booster cannister
> > was considerably thicker front to rear. The GMC application had the
> normal
> > thickness and bracket and MC. Perhaps some mixing and matching of booster
> > parts?
> > Kinda looks to me like a convenient way to plumb in an aux. vacuum pump.
> >
> > On Tue, Jul 20, 2010 at 11:45 AM, Bob de Kruyff <NEXT2POOL@aol.com>
> wrote:
> >
> > >
> > >
> > > I have seen those two check valve boosters before. I think they were
> > > designed for applications with two vacuum sources such as the engine
> and
> > an
> > > external pump. I've never seen them "T" in an original installation and
> I
> > > can't see any benefit to that. Sounds like it is an adaptation of a
> dual
> > > input booster to a single input source.
> > > --
> > > Bob de Kruyff
> > > 78 Eleganza
> > > Chandler, AZ
> > > _______________________________________________
> > > GMCnet mailing list
> > > List Information and Subscription Options:
> > > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> > >
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Michael Beaton
> 1977 Kingsley 26-11
> 1977 Eleganza II 26-3
> Antigonish, NS
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Power Brake Booster [message #92794 is a reply to message #92793] |
Wed, 21 July 2010 09:57 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| Gary Berry wrote on Wed, 21 July 2010 08:52 |
Hey;
So I was talking to GeneF this past weekend about the fact that I
don't have the emergency vac pump connected to my coach and that I
need one ( I actually have the pump in my shop)
]\[;/. Since I have this dual-port brake booster, does this mean I can
reconfigure my setup to add this pump by just plumbing it into one of
these ports? Cause, I'll do it...
--
Gary and Diana Berry
73 CL Stretch in Wa.
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Yup--that's a good way to do it--make sure you use a check valve in that port.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Power Brake Booster [message #92795 is a reply to message #92793] |
Wed, 21 July 2010 09:58 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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| Gary Berry wrote on Wed, 21 July 2010 08:52 |
Hey;
So I was talking to GeneF this past weekend about the fact that I
don't have the emergency vac pump connected to my coach and that I
need one ( I actually have the pump in my shop)
]\[;/. Since I have this dual-port brake booster, does this mean I can
reconfigure my setup to add this pump by just plumbing it into one of
these ports? Cause, I'll do it...
--
Gary and Diana Berry
73 CL Stretch in Wa.
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That's the way to do it. Make sure you use a check valve in that port.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Power Brake Booster [message #92800 is a reply to message #92783] |
Wed, 21 July 2010 11:10 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Emery, when I attended GM training at the Tigard Center back in the 80's,
there was some handouts on the delco-morraine booster and the molded plastic
check valve that goes into the grommet on the booster was described as a
multi purpose valve, one being to allow controlled escape of vacuum, and the
other being to prevent damage to the booster diaphram and other internal
parts when backfires occur in the intake system. I guess it was just me
referring to that function and not the other that led to where we are now. I
thought when I saw Gary's double valve setup that would make a dandy place
to plumb the aux. vacuum pump, and wondered if anyone out there had in fact
encountered a booster like Garys and it turns out you guys had the answer
Gary needed. The GMCnet is a living breathing critter again.
Jim Hupy
78 Royale 403
Salem, Or
On Wed, Jul 21, 2010 at 6:28 AM, Emery Stora <emerystora@mac.com> wrote:
>
> On Jul 20, 2010, at 8:43 PM, Charles Boyd wrote:
>
> >
> >
> > James Hupy wrote on Tue, 20 July 2010 11:42
> >> Brake booster question. When I was looking at Gary Berry's Master
> Cylinder
> >> last night in the Kmart Parking lot in Salem, I noticed that his Booster
> had
> >> two anti-backfire valves in the booster that were connected to a short
> piece
> >> of hose w/a T in the middle to connect to a Vacuum source. Hadn't run
> across
> >> one exactly like this one. Anyone know what it might be off of?
> >> Jim Hupy
> >> Salem, Or
> >> 78 Royale 403
>
> My GMC has a booster that has two ports. One of them has the standard
> check valve and he other just has a plug.
> They don't have to both be used as they lead to the same chamber.
>
> I have never heard them called anti-backfire valves. They are really just
> check valves to keep the vacuum in the booster.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>
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| Re: [GMCnet] Power Brake Booster [message #92827 is a reply to message #92667] |
Wed, 21 July 2010 17:27 |
Firefly
Messages: 98
Registered: May 2008
Location: Augusta, Maine
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Guys,
What exactly is a 'sensitized' brake booster all about, anyway?
Are we talking EST training, or what?
Mark Scoble, Lunenburg, MA - 1973 23' Palm Beach Stretched to 32' and in residence at the GMC Co-Op in Orlando, FL
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| Re: [GMCnet] Power Brake Booster [message #92829 is a reply to message #92827] |
Wed, 21 July 2010 17:32 |
Mr ERFisher
Messages: 7117
Registered: August 2005
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did you read this ?
http://www.leighharrisongmcmotorhomeupgrades.com/SensitizedVacuumBooster.html
sending backwards
gene
On Wed, Jul 21, 2010 at 3:27 PM, Mark Scoble <worldnet@aol.com> wrote:
>
>
> Guys,
>
> What exactly is a 'sensitized' brake booster all about, anyway?
>
> Are we talking EST training, or what?
> --
> Mark Scoble, Augusta, Maine - 1973 23' Palm Beach Stretched to 32' and
> undergoing complete renovation at the GMC Co-Op
>
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Power Brake Booster [message #92876 is a reply to message #92667] |
Thu, 22 July 2010 10:58 |
Firefly
Messages: 98
Registered: May 2008
Location: Augusta, Maine
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"did you read this ?
http://www.leighharrisongmcmotorhomeupgrades.com/SensitizedVacuumBooster.html
sending backwards
gene"
Yes I did - did you read mine? I asked about the details and you referred me to a sales page with little else but specs on the amount of effort involved to activate it, which would be fine if I was a catalog shopper. I wanted the details on *how* it is "sensitized" to achieve this effect. Is there a off-the-shelf part or component used in rebuilding the stock unit or what? If using a lighter return spring of unknown specification is the effective element in this component, then we should be privy to the specs so we can replicate the benefit.
Being largely a cheepo/do-it-yourself forum I would have expected this to be more informative than simply a source selection exercise. Or is this 'bad juju' to wonder how something was accomplished so we can learn and perhaps do it ourselves?
Mark Scoble, Lunenburg, MA - 1973 23' Palm Beach Stretched to 32' and in residence at the GMC Co-Op in Orlando, FL
[Updated on: Thu, 22 July 2010 11:03] Report message to a moderator |
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| Re: [GMCnet] Power Brake Booster [message #92877 is a reply to message #92827] |
Thu, 22 July 2010 11:34 |
Mr ERFisher
Messages: 7117
Registered: August 2005
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>
>
> Guys,
>
> What exactly is a 'sensitized' brake booster all about, anyway?
>
> sorry
this is the part I was answering
*Benefits: Great performance enhancer to the Brake Master Cylinder Kit / Old
Vacuum boosters required 75lbs pedal pressure to activate valve. Sensitized
Booster initiates valve at 15lbs, and is fully activated at 25lbs pedal
pressure.No sending back your old booster for push rod.
* I did not see the part about how you wanted to do it your self
gene
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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