Home » Public Forums » GMCnet » [GMCnet] New Item-Vacuum pump ...read on
| [GMCnet] New Item-Vacuum pump ...read on [message #163658] |
Tue, 20 March 2012 19:33  |
paul h cashman
Messages: 176
Registered: May 2005
Karma: 0
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Hi,
I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
Booster ,so I could check the vacuum at the Brake booster ,I was told years
ago this would not work, due to the check Valves ,but I did it anyway.
Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum Pump
running and I can see about 17 inches of Mercury on the Vacuum Gauge and I'm
ready to go, Before I turn the Ignition Switch on.
Paul Cashman
Riverdale GA
78 Transmode
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Paul H Cashman
Riverdale Ga
1978 Transmode
1975 Corvette
1978 Beetle Convertible
1989 Harley Davidson Sportster
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163660 is a reply to message #163658] |
Tue, 20 March 2012 19:58  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Good idea. I'm sure that with experience, you can tell from the pump's run
time whether there was still vacuum in the booster.
Ken H.
On Tue, Mar 20, 2012 at 8:33 PM, Paul Cashman <paulcashman@bellsouth.net>wrote:
> Hi,
>
> I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
> Booster ,so I could check the vacuum at the Brake booster ,I was told years
> ago this would not work, due to the check Valves ,but I did it anyway.
>
> Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum Pump
> running and I can see about 17 inches of Mercury on the Vacuum Gauge and
> I'm
> ready to go, Before I turn the Ignition Switch on.
>
> Paul Cashman
>
> Riverdale GA
>
> 78 Transmode
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163663 is a reply to message #163658] |
Tue, 20 March 2012 20:27 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| paul h cashman wrote on Tue, 20 March 2012 18:33 |
Hi,
I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
Booster ,so I could check the vacuum at the Brake booster ,I was told years
ago this would not work, due to the check Valves ,but I did it anyway.
Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum Pump
running and I can see about 17 inches of Mercury on the Vacuum Gauge and I'm
ready to go, Before I turn the Ignition Switch on.
Paul Cashman
Riverdale GA
78 Transmode
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One thing I like about the vacuum reservoir is that it will store the highest vacuum that it sees--so on over-run such as going down a grade or a long decel, it will experience and "store" high vacuum levels that a pump normally won't attain on its' own.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163680 is a reply to message #163658] |
Tue, 20 March 2012 22:37 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Paul,
Before I start the engine I set my Power Level to TRAVEL and then turn on
the ignition. I can hear my Viair pump and brake booster aux vacuum pump
start up. I start the engine and wait until they both shut down before put
the trans in Drive.
Regards,
Rob
-----Original Message-----
From: Paul Cashman
Hi,
I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
Booster ,so I could check the vacuum at the Brake booster ,I was told years
ago this would not work, due to the check Valves ,but I did it anyway.
Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum Pump
running and I can see about 17 inches of Mercury on the Vacuum Gauge and I'm
ready to go, Before I turn the Ignition Switch on.
Paul Cashman
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163683 is a reply to message #163680] |
Tue, 20 March 2012 22:49 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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did you forget the electric gas pump?
like listening to the signs of life;>)
gene
On Tue, Mar 20, 2012 at 8:37 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> Paul,
>
>
> Before I start the engine I set my Power Level to TRAVEL and then turn on
> the ignition. I can hear my Viair pump and brake booster aux vacuum pump
> start up. I start the engine and wait until they both shut down before put
> the trans in Drive.
>
> Regards,
> Rob
>
> -----Original Message-----
> From: Paul Cashman
>
> Hi,
>
> I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
> Booster ,so I could check the vacuum at the Brake booster ,I was told years
> ago this would not work, due to the check Valves ,but I did it anyway.
>
> Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum Pump
> running and I can see about 17 inches of Mercury on the Vacuum Gauge and
> I'm
> ready to go, Before I turn the Ignition Switch on.
>
> Paul Cashman
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
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] New Item-Vacuum pump ...read on [message #163702 is a reply to message #163658] |
Wed, 21 March 2012 00:55 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Senior Member |
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i need one of these. what pump should i use. and how does it install just in line with the regular line.
any pictures. what pump is best. I go in the steep hills a lot and i need one i know.
On Mar 20, 2012, at 5:33 PM, Paul Cashman wrote:
> Hi,
>
> I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
> Booster ,so I could check the vacuum at the Brake booster ,I was told years
> ago this would not work, due to the check Valves ,but I did it anyway.
>
> Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum Pump
> running and I can see about 17 inches of Mercury on the Vacuum Gauge and I'm
> ready to go, Before I turn the Ignition Switch on.
>
> Paul Cashman
>
> Riverdale GA
>
> 78 Transmode
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163707 is a reply to message #163702] |
Wed, 21 March 2012 06:38 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Vacuum booster pump ?
yes you do need one(everyone does), you cannot store enough vacuum to get
out of these situations
http://gmcmotorhome.info/addens.html#story
here is the poop, on what it is, and how to install it.
http://goo.gl/ksy8z
this is really the only pump to use, it is built for this application and
has all the relays, sensors , etal you need, and is very simple to mount
and put in series with the existing vacuum lines.
JimK sells them
http://www.appliedgmc.com/prod.itml/icOid/769
only buy it with the original connector on the cable
gene
> i need one of these. what pump should i use. and how does it install just
> in line with the regular line.
>
> any pictures. what pump is best. I go in the steep hills a lot and i need
> one i know.
>
>
>
>
> On Mar 20, 2012, at 5:33 PM, Paul Cashman wrote:
>
> > Hi,
> >
> > I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
> > Booster ,so I could check the vacuum at the Brake booster ,I was told
> years
> > ago this would not work, due to the check Valves ,but I did it anyway.
> >
> > Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum
> Pump
> > running and I can see about 17 inches of Mercury on the Vacuum Gauge and
> I'm
> > ready to go, Before I turn the Ignition Switch on.
> >
> > Paul Cashman
> >
> > Riverdale GA
> >
> > 78 Transmode
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
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] New Item-Vacuum pump ...read on [message #163714 is a reply to message #163707] |
Wed, 21 March 2012 07:23 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I've a pump removed from a GMC (midsize Pontiac, I think) which was intended for the same purpose. Works just fine. Took some conniving though, I had to gin up a mount for it.
Â
--johnny
Â
'76 23' transmode norris
'76 palm beach
From: gene Fisher <mr.erfisher@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, March 21, 2012 7:38 AM
Subject: Re: [GMCnet] New Item-Vacuum pump ...read on
Vacuum booster pump ?
yes you do need one(everyone does), you cannot store enough vacuum to get
out of these situations
http://gmcmotorhome.info/addens.html#story
here is the poop, on what it is, and how to install it.
http://goo.gl/ksy8z
this is really the only pump to use, it is built for this application and
has all the relays, sensors , etal you need, and is very simple to mount
and put in series with the existing vacuum lines.
JimK sells them
http://www.appliedgmc.com/prod.itml/icOid/769
only buy it with the original connector on the cable
gene
> i need one of these. what pump should i use. and how does it install just
> in line with the regular line.
>
> any pictures. what pump is best. I go in the steep hills a lot and i need
> one i know.
>
>
>
>
> On Mar 20, 2012, at 5:33 PM, Paul Cashman wrote:
>
> >Â Hi,
> >
> > I hooked up my Vacuum Gauge at a tee between my vacuum pump and Brake
> > Booster ,so I could check the vacuum at the Brake booster ,I was told
> years
> > ago this would not work, due to the check Valves ,but I did it anyway.
> >
> > Before I go on a trip ,I stand on the Brake Pedal and hear the Vacuum
> Pump
> > running and I can see about 17 inches of Mercury on the Vacuum Gauge and
> I'm
> > ready to go, Before I turn the Ignition Switch on.
> >
> > Paul Cashman
> >
> > Riverdale GA
> >
> > 78 Transmode
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
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
_______________________________________________
GMCnet mailing list
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http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163716 is a reply to message #163709] |
Wed, 21 March 2012 08:11 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""just does not matter. one pump and this advantage is gone,
leave your foot on the brake, and the whole vacuum storage is gone
""
That does not seem to be the case. My booster only "depletes"
vacuum while the pedal is moved. If I push it and hold, it does not deplete the entire tank. I think we went through this a few years ago and determined that only those that had sensitized boosters ran into that issue. I can push and hold the pedal depressed and still have 5 pushes left.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163727 is a reply to message #163716] |
Wed, 21 March 2012 09:48 |
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I think this actually depends on if you have the original cruise control or
not. There is a vacuum dump that disconnects the cruise when the brake
pedal is depressed. Those of us with electronic cruise have disconnected or
plugged that hose and can hold brakes without depleting vacuum.
I reckon a hole in the 35 year old rubber booster diaphragm would bleed
vacuum though.
Belt and suspenders doesn't hurt
bdub
-----Original Message-----
From: Behalf Of Bob de Kruyff
""just does not matter. one pump and this advantage is gone, leave your foot
on the brake, and the whole vacuum storage is gone""
That does not seem to be the case. My booster only "depletes" vacuum while
the pedal is moved. If I push it and hold, it does not deplete the entire
tank. I think we went through this a few years ago and determined that only
those that had sensitized boosters ran into that issue. I can push and hold
the pedal depressed and still have 5 pushes left.
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bdub
bdub.net
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| Re: [GMCnet] New Item-Vacuum pump ...read on [message #163738 is a reply to message #163727] |
Wed, 21 March 2012 10:55 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""I think this actually depends on if you have the original cruise control or
not. There is a vacuum dump that disconnects the cruise when the brake
pedal is depressed. Those of us with electronic cruise have disconnected or
plugged that hose and can hold brakes without depleting vacuum.
"" I don't think there's any vacuum on that cruise dump unless the cruise is on--which it wouldn't be after the first application. We never did figure out why some sensitized boosters bled vacuum with the pedal depressed but stationary--such as when brakes are applied but not pumped. I'm not against a vacuum pump and when I do get the chance, I'm going to put one on together with the reserve tank. Frankly, if the brakes are being pumped, I don't think any of the pumps can keep up with that.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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