Home » Public Forums » GMCnet » Ford A426C brake vacuum pump, your opinion please?
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| Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please? [message #327536 is a reply to message #327535] |
Thu, 28 December 2017 09:27   |
GMC.LES
Messages: 505
Registered: April 2014
Karma: -2
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Senior Member |
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The A426C pump is a good pump, made with a cast zinc/aluminum alloy body.
There is a revised version now being made with a composite body.
The only reason I mention this is because Ford was having severe corrosion issues with the metal body pumps when exposed to road salt in northern climates. The solution was the composite body.
Does any of this make one pump better than another when the pump is used on a TZE? I rather doubt it.
Rockauto sells the a new composite pump for approx $200usd, so keep that in mind with regards to putting a price on the pump you found.
RobM recently provided comparison details on both pumps, so look up his recent posts if you need more data.
Les Burt
Montreal
'75 Eleganza 26'
> On Dec 28, 2017, at 10:02 AM, Mike wrote:
>
> Hello, a fellow GMC'er has listed a Ford A426C pump for sale which I have expressed interest in purchasing.
>
> Is this a good back up choice or is there something better out there, I seem to recall reading a short time ago about a newer system but can not find
> the post right now?
>
> Your opinion on this is important, it will help me make a more informed decision on this system for back-up braking in an emergency situation.
>
> I have a 1975 Coachmen built Royale, 26' with a 455.
>
> Regards,
> Mike
>
> _______________________________________________
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| Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please? [message #327550 is a reply to message #327549] |
Thu, 28 December 2017 22:53 |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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Dave,
I have run many combo of brakes over the years. I did have 6 wheel disk which was 80MM on the front and a Harrison setup on the middle bogie which has a 12.5 in Ford disk with the 80MM caliper and a Cad set up with the stock Cad cal with emergency brake option. See these pictures.d I also show the comparison between the Harrison and Cad rotor.
http://www.gmcmhphotos.com/photos/g5661-disk-brake-upgrade-leigh-harrison-brakes.html
The combo I run now is still the 80MM on the front, Harrison on the middle with 80MM and standard drum brake on the rear with a 15/16 inch slave cylinder and carbon metallic shoes. I will probably go to a 7/8 inch slave on the rear the next time I do a complete service on the brakes.
The majority of the braking is provided by the middle bogie with the rear not locking up. The real difference is that I have gotten the brake pressure back up to about 1200 psi compared to about 900 psi with the p30 master. Pressure means power to stop. The more pressure that you have at the brakes is king. If you have more questions I may answer ask.
J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan
> On Dec 28, 2017, at 9:33 PM, David Shafer wrote:
>
> powwerjon,
>
> That is a nice looking setup up top. What is your choice at the wheels? ...six disks or less? If you are running disk brakes at the rear, what size
> rotors?
> Thanks,
> Dave
> --
> 1977 26 foot 403
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please? [message #327552 is a reply to message #327536] |
Thu, 28 December 2017 23:27 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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For those that want a ready to install kit, we have them .
You can see them on our web site.
On Thu, Dec 28, 2017 at 9:19 PM, Rob Mueller
wrote:
> Dave,
>
> Here's a link on how to install Cadillac disk brakes on the rear of a GMC:
>
> http://www.gmcgreatlakers.org/gmcing/tech_docs/6-WheelDiskBrakes.pdf
>
> Double Trouble has OEM disks on the front with 80 mm calipers, Caddy disks
> on the middle wheels with 80 mm calipers; and OEM drums
> on the rear. I did that because I needed to have an emergency brake to
> pass NJ inspection which is where I registered it when I
> bought it.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Newark,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] Ford A426C brake vacuum pump, your opinion please? [message #327560 is a reply to message #327552] |
Fri, 29 December 2017 09:55 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Hi, Jim.
Is that a kit to install the Ford A426C vacuum pump or Caddy brakes?
Mac in OKC
"The Money Pit"
________________________________
From: Gmclist on behalf of Jim Kanomata
Sent: Thursday, December 28, 2017 23:27
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please?
For those that want a ready to install kit, we have them .
You can see them on our web site.
On Thu, Dec 28, 2017 at 9:19 PM, Rob Mueller
wrote:
> Dave,
>
> Here's a link on how to install Cadillac disk brakes on the rear of a GMC:
>
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.gmcgreatlakers.org%2Fgmcing%2Ftech_docs%2F6-WheelDiskBrakes.pdf&data=02%7C01% 7C%7C7b2ee6a45732450159f408d54e7cf301%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636501220909006303&sdata=V7vAIY1dlZ7QV6WDSQdgUB4PccAhl%2Fl22tbb FF5L5oo%3D&reserved=0
>
> Double Trouble has OEM disks on the front with 80 mm calipers, Caddy disks
> on the middle wheels with 80 mm calipers; and OEM drums
> on the rear. I did that because I needed to have an emergency brake to
> pass NJ inspection which is where I registered it when I
> bought it.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
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| Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please? [message #327561 is a reply to message #327550] |
Fri, 29 December 2017 10:47 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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John,
What is the purpose of the piece of angle iron attached to the rear of the
caliper bracket?
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "John Wright"
Sent: Thursday, December 28, 2017 11:53 PM
To:
Subject: Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please?
> Dave,
> I have run many combo of brakes over the years. I did have 6 wheel disk
> which was 80MM on the front and a Harrison setup on the middle bogie which
> has a 12.5 in Ford disk with the 80MM caliper and a Cad set up with the
> stock Cad cal with emergency brake option. See these pictures.d I also
> show the comparison between the Harrison and Cad rotor.
>
> http://www.gmcmhphotos.com/photos/g5661-disk-brake-upgrade-leigh-harrison-brakes.html
>
> The combo I run now is still the 80MM on the front, Harrison on the middle
> with 80MM and standard drum brake on the rear with a 15/16 inch slave
> cylinder and carbon metallic shoes. I will probably go to a 7/8 inch
> slave on the rear the next time I do a complete service on the brakes.
>
> The majority of the braking is provided by the middle bogie with the rear
> not locking up. The real difference is that I have gotten the brake
> pressure back up to about 1200 psi compared to about 900 psi with the p30
> master. Pressure means power to stop. The more pressure that you have at
> the brakes is king. If you have more questions I may answer ask.
>
> J.R. Wright
> GMC GreatLakerTech Editor
> 78 Buskirk 30' Stretch
> 75 Avion Under Reconstruction
> Michigan
>
>
>> On Dec 28, 2017, at 9:33 PM, David Shafer
>> wrote:
>>
>> powwerjon,
>>
>> That is a nice looking setup up top. What is your choice at the wheels?
>> ...six disks or less? If you are running disk brakes at the rear, what
>> size
>> rotors?
>> Thanks,
>> Dave
>> --
>> 1977 26 foot 403
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
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Unsubscribe or Change List Options:
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| Re: Ford A426C brake vacuum pump, your opinion please? [message #327565 is a reply to message #327535] |
Fri, 29 December 2017 11:56 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I put a GM pump from a midsize late 80s Buick from Pick n Pay on the 23', along with a reservoir made from 3 feet of four inch PVC which worked fine. Current 26' has the Ford pump fitted, but no reservoir. Given the cam in it, it needs the pump.
--johnny
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] Ford A426C brake vacuum pump, your opinion please? [message #327570 is a reply to message #327568] |
Fri, 29 December 2017 14:14 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Mike,
Below you will find a couple of emails I sent in earlier this month.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426 USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Rob Mueller
Sent: Saturday, December 9, 2017 11:43 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Ford Azure / F-150 Eco Boost Vacuum Pumps
G'day,
Additional info on the F-150 Eco Boost Pump:
RockAuto P/N: MOTORCRAFT BRPV30
Link: https://www.rockauto.com/en/parts/motorcraft,BRPV30,vacuum+pump,5172
McMaster-Carr Rubber isolator mounts:
https://www.mcmaster.com/#rubber-isolators/=1alwgb6
I used a metric size for the metal Azure pump and don't remember the size, sorry.
You'll have to tap the plastic pump screw holes to install rubber isolators therefore you'll have figger out what size to use after
you tap them.
Regards,
Rob M.
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Rob Mueller
Sent: Friday, December 8, 2017 9:58 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Ford Azure / F-150 Eco Boost Vacuum Pumps
G'day,
As promised here's a revised album showing both the Ford Azure and F-150 Eco Boost Vacuum pumps.
http://www.gmcmhphotos.com/photos/g7124-ford-azure-2f-f-150-eco-boost-vacuum-pump.html
Feel free to ask questions.
I spoke to Dave Lenzi and he's still selling his kit; please contact him directly for info on the kit:
http://www.gmcmotorhomemarketplace.com/lenzi/index.html
Regards,
Rob M.
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Mike
Sent: Saturday, December 30, 2017 6:00 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please?
Looks like I missed out on the pump advertised on the GMC Swap Meet forum, I responded pretty quick but someone else beat me to it.
If you have one you would like to sell please let me know?
There are approximately 13 options available from the GMC motorhome page (http://www.gmcmotorhome.com/tech/vacuum_pump/index.html)
as well as the GM
offered pump, are these antiquated or have they been surpassed by newer technology?
If there is a newer / better alternative (subjective I know) available, I'm still open to options as I would like to fit my coach
with some back-up system?
Thanks again,
Mike
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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] Ford A426C brake vacuum pump, your opinion please? [message #327572 is a reply to message #327536] |
Fri, 29 December 2017 14:50 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
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A running GMC engine in good shape, at sea level, will make in excess of 25
inches of vacuum at 30 mph with your foot off the gas. Like when you might
be using the brakes. It will make 2 or 3 times more vacuum than your coach
brakes will ever need.
So, now we have established that a running coach really does not have
any need for an auxiliary vacuum pump, we can deal with "Yes, but, OMG,
what if the engine quits?" The booster has enough reserve vacuum for you
to bring the coach to a safe stop, ONCE. If the GMC needed an auxiliary
vacuum pump, why didn't GMC install one from the factory? Because it was
not needed? Don't know for sure if that is the real reason, but, it seems
likely to me. A hydro boost system is also reliant upon the engine running
to be able to multiply the pedal effort. No back up system there, either.
Seems to me that it would make good sense to insure that the fuel
tanks are not close to empty, and that the engine is in good enough shape
that it does not stop running except when the driver wants it to. But, it's
your money, spend it how you want.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Dec 29, 2017 12:15 PM, "Rob Mueller" wrote:
Mike,
Below you will find a couple of emails I sent in earlier this month.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426 USA '77 Kingsley - TZE
267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Rob
Mueller
Sent: Saturday, December 9, 2017 11:43 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Ford Azure / F-150 Eco Boost Vacuum Pumps
G'day,
Additional info on the F-150 Eco Boost Pump:
RockAuto P/N: MOTORCRAFT BRPV30
Link: https://www.rockauto.com/en/parts/motorcraft,BRPV30,vacuum+pump,5172
McMaster-Carr Rubber isolator mounts:
https://www.mcmaster.com/#rubber-isolators/=1alwgb6
I used a metric size for the metal Azure pump and don't remember the size,
sorry.
You'll have to tap the plastic pump screw holes to install rubber isolators
therefore you'll have figger out what size to use after
you tap them.
Regards,
Rob M.
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Rob
Mueller
Sent: Friday, December 8, 2017 9:58 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Ford Azure / F-150 Eco Boost Vacuum Pumps
G'day,
As promised here's a revised album showing both the Ford Azure and F-150
Eco Boost Vacuum pumps.
http://www.gmcmhphotos.com/photos/g7124-ford-azure-2f-f-
150-eco-boost-vacuum-pump.html
Feel free to ask questions.
I spoke to Dave Lenzi and he's still selling his kit; please contact him
directly for info on the kit:
http://www.gmcmotorhomemarketplace.com/lenzi/index.html
Regards,
Rob M.
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Mike
Sent: Saturday, December 30, 2017 6:00 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please?
Looks like I missed out on the pump advertised on the GMC Swap Meet forum,
I responded pretty quick but someone else beat me to it.
If you have one you would like to sell please let me know?
There are approximately 13 options available from the GMC motorhome page (
http://www.gmcmotorhome.com/tech/vacuum_pump/index.html)
as well as the GM
offered pump, are these antiquated or have they been surpassed by newer
technology?
If there is a newer / better alternative (subjective I know) available, I'm
still open to options as I would like to fit my coach
with some back-up system?
Thanks again,
Mike
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please? [message #327578 is a reply to message #327572] |
Fri, 29 December 2017 15:27 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
|
Senior Member |
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> On Dec 29, 2017, at 1:50 PM, James Hupy wrote:
>
> A running GMC engine in good shape, at sea level, will make in excess of 25
> inches of vacuum at 30 mph with your foot off the gas. Like when you might
> be using the brakes. It will make 2 or 3 times more vacuum than your coach
> brakes will ever need.
> So, now we have established that a running coach really does not have
> any need for an auxiliary vacuum pump,
NO we haven’t. How often is the average GMC er going to be driving at sea level at 30 mph with his foot off the gas???
More likely the need to apply the brakes is when some idiot cuts you off at highway speeds when you are at 3000 to 7000 feet elevation. Or if there is an accident in front of you.
What is the vacuum there? Probably closer to 10 inches than 25 inches. The vacuum pump at those conditions will be closer to 20 inches.
Ask Dave Lenzi how much more braking you’ll have with your booster at 20 instead of 10. Or watch one of his demonstration when he has a booster and vacuum pump hooked up to a master cylinder with pressure gauges at one of the GMCMI conventions.
If you are in a panic braking situation you’ll be very thanking that you have a vacuum pump attached to your booster instead of depending on engine vacuum alone.
Now, if your only concern is how many pumps you have for your brakes when rolling backwards on a hill you may be OK without a pump but a lot of people that have been in that situation will disagree with you.
Emery Stora
77 Kingsley
Frederick, CO
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| Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please? [message #327580 is a reply to message #327572] |
Fri, 29 December 2017 16:14 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
|
Senior Member |
|
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IMHO, the most reliable and economical backup for vacuum brakes is a large
reservoir, such as a 30" section of 4" pvc pipe mounted inside the GMC's
front cross member with wire ties. Properly constructed and installed,
such a device should hold enough vacuum for 2-3 fully assisted brake
applications at near the ambient atmospheric pressure. That assumption is
based on the likelihood that since the last previous brake application
(including the current stop) the engine will have been providing its full
vacuum capability several times. With the engine braking at closed
throttle the vacuum it generates should be nearly as good as a
purpose-designed vacuum pump. Installing a vacuum gauge and monitoring it
during normal driving will show that full vacuum occurs at almost every
significant deceleration event -- the reservoir will capture and retain
that vacuum.
Achieving that "proper construction and installation" may not be as easy as
it sounds. I've made quite a few of them and found that leak-proofing can
be difficult. There must be a check valve at the "entry" to the reservoir
(the connection to the engine). I found that many new off-the-shelf
booster check valves leak; my best source proved to be the junk yard. More
than one check valve removed from long-stored junkers released vacuum when
pulled from their boosters. The hose connections to the reservoir and to
the various components, including the check valve at the booster, and its
mounting grommet, MUST be snug & air tight. Vacuum is easily destroyed by
the smallest air leak.
This is not to denigrate the value of an electric boost pump, but absent
that more expensive improvement, the reservoir is a vast improvement over
just booster reserve. I always ran both.
Ken H.
On Fri, Dec 29, 2017 at 3:50 PM, James Hupy wrote:
> A running GMC engine in good shape, at sea level, will make in excess of 25
> inches of vacuum at 30 mph with your foot off the gas. Like when you might
> be using the brakes. It will make 2 or 3 times more vacuum than your coach
> brakes will ever need.
> So, now we have established that a running coach really does not have
> any need for an auxiliary vacuum pump, we can deal with "Yes, but, OMG,
> what if the engine quits?" The booster has enough reserve vacuum for you
> to bring the coach to a safe stop, ONCE. If the GMC needed an auxiliary
> vacuum pump, why didn't GMC install one from the factory? Because it was
> not needed? Don't know for sure if that is the real reason, but, it seems
> likely to me. A hydro boost system is also reliant upon the engine running
> to be able to multiply the pedal effort. No back up system there, either.
> Seems to me that it would make good sense to insure that the fuel
> tanks are not close to empty, and that the engine is in good enough shape
> that it does not stop running except when the driver wants it to. But, it's
> your money, spend it how you want.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
> On Dec 29, 2017 12:15 PM, "Rob Mueller" wrote:
>
> Mike,
>
> Below you will find a couple of emails I sent in earlier this month.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426 USA '77 Kingsley - TZE
> 267V100808
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Rob
> Mueller
> Sent: Saturday, December 9, 2017 11:43 PM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Ford Azure / F-150 Eco Boost Vacuum Pumps
>
> G'day,
>
> Additional info on the F-150 Eco Boost Pump:
>
> RockAuto P/N: MOTORCRAFT BRPV30
>
> Link: https://www.rockauto.com/en/parts/motorcraft,BRPV30,vacuum+pump,5172
>
> McMaster-Carr Rubber isolator mounts:
>
> https://www.mcmaster.com/#rubber-isolators/=1alwgb6
>
> I used a metric size for the metal Azure pump and don't remember the size,
> sorry.
>
> You'll have to tap the plastic pump screw holes to install rubber isolators
> therefore you'll have figger out what size to use after
> you tap them.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Rob
> Mueller
> Sent: Friday, December 8, 2017 9:58 PM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Ford Azure / F-150 Eco Boost Vacuum Pumps
>
> G'day,
>
> As promised here's a revised album showing both the Ford Azure and F-150
> Eco Boost Vacuum pumps.
>
> http://www.gmcmhphotos.com/photos/g7124-ford-azure-2f-f-
> 150-eco-boost-vacuum-pump.html
>
> Feel free to ask questions.
>
> I spoke to Dave Lenzi and he's still selling his kit; please contact him
> directly for info on the kit:
>
> http://www.gmcmotorhomemarketplace.com/lenzi/index.html
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Mike
> Sent: Saturday, December 30, 2017 6:00 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Ford A426C brake vacuum pump, your opinion please?
>
> Looks like I missed out on the pump advertised on the GMC Swap Meet forum,
> I responded pretty quick but someone else beat me to it.
>
> If you have one you would like to sell please let me know?
>
> There are approximately 13 options available from the GMC motorhome page (
> http://www.gmcmotorhome.com/tech/vacuum_pump/index.html)
> as well as the GM
> offered pump, are these antiquated or have they been surpassed by newer
> technology?
>
> If there is a newer / better alternative (subjective I know) available, I'm
> still open to options as I would like to fit my coach
> with some back-up system?
>
> Thanks again,
> Mike
>
>
>
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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: Ford A426C brake vacuum pump, your opinion please? [message #327591 is a reply to message #327535] |
Sat, 30 December 2017 07:56 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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One comment on Ken's approach - please don't use Ty-Raps <tm> (Known as zip ties) to hold the canister. The white ones deteriorate in ozone and sunshine, the black <UV proof> ones are quite brittle. Use stainless steel hose clamps to fasten the canister to the crossmember. If it manages to fall off and pull the lines loose, you'll have zero boost to stop.
--johnny
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] Ford A426C brake vacuum pump, your opinion please? [message #327595 is a reply to message #327591] |
Sat, 30 December 2017 08:18 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Good idea, Johnny, even though I've never had one of the black 3/8"x18"
tywraps fail. And I usually use 4 of them, two around the upper and two
around the lower web of the cross member.
Ken H.
On Sat, Dec 30, 2017 at 8:56 AM, Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> One comment on Ken's approach - please don't use Ty-Raps (Known as
> zip ties) to hold the canister. The white ones deteriorate in ozone and
> sunshine, the black ones are quite brittle. Use stainless
> steel hose clamps to fasten the canister to the crossmember. If it manages
> to
> fall off and pull the lines loose, you'll have zero boost to stop.
>
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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: Ford A426C brake vacuum pump, your opinion please? [message #327596 is a reply to message #327535] |
Sat, 30 December 2017 08:21 |
 |
RF_Burns
Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Just my farm-boy mechanic thoughts on vacuum pumps and reservoirs.
In my opinion, both are a great idea. I do have an opinion (or idea) on how they should be plumbed and why. The engine has a huge capacity to draw down vacuum (hoping that is proper terminology), as compared to an electric pump. I currently have a JC4 pump which is plumbed in series between the vacuum booster and the engine, in other words the engine vacuum flows through the pump. My idea is the system should be plumbed in the following order.
Vacuum booster ->check valve --> vacuum pump ---> vacuum reservoir ->check valve ---> engine.
My reasoning is the engine's vacuum capacity will draw down the reservoir and booster almost immediately and the check valves will keep the system at maximum vacuum (or minimum depending on your point of view). If the engine quits, and say you were going down a hill which required multiple brake applications, the vacuum reservoir would provide a source of vacuum for a short while. Once the reservoir vacuum went below the pump setting, then the pump would start.
Now this is point where my configuration come into play. With the pump in-line right at the booster, there is only the booster reservoir to pump down, so the pump should be able to do that fairly quickly to regain power in the brakes. If the pump had to draw down the reservoir as well, it would take much longer to do so and in the meantime your booster brake assist would be very poor.
Does this make sense? I haven't seen where this has been written-up in the past. Or maybe my assumptions are all wrong here.
Comments or ideas?
Thanks
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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