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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 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
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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