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Looking to see if this is something we could use [message #323109]

Fri, 01 September 2017 14:32

GatsbysCruise

Messages: 261
Registered: January 2017
Location: Waukegan, Illinois

Karma: 3

Senior Member

As my long power loss project continues, and seemingly, the problem has been found, I am always looking for anything that can be useful to the community. As we know, a vacuum pump is more or less required for the brakes to prevent loss of brakes when the vacuum from the engine is lost.

Is this vacuum pump strong enough for our needs??? if so, the cost isn't bad.

12 VDC 11" HG VACUUM PUMP
item number: 4-1831
PRICE: $18.95

http://www.surpluscenter.com/Air-Pneumatics/Air-Compressors-Vacuum-Pumps/Vacuum-Pumps/12-VDC-11-HG-VACUUM-PUMP-4-1831.axd

Thanks for any info

s

GatsbysCruise. \ 74GMC260 Former Glacier Model style. \ Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center

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Re: Looking to see if this is something we could use [message #323117 is a reply to message #323109]

Fri, 01 September 2017 15:55

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Make a reservoir - 3 feet or so of 4" PVC capped and strap it to the frame behind the bumper. That's worth two or three stops by itself. Hook the pump to it and then see how long itruns before it shuts off. Report back.

--johnny

DOS Tip: Use check valve so that a catastrophic failure of pump or reservoir doesnt leave you brakeless.

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: Looking to see if this is something we could use [message #323125 is a reply to message #323117]

Fri, 01 September 2017 18:16

Bullitthead

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

I wonder if it has an automatic shutoff...might have been turned on and off by the ECM in the vehicle and so might require some control method beyond an on/off switch. Unless you automatically turn it on when you head down the mountain! Laughing

At any rate, shipping to my zip almost doubles the price, but now I know another vehicle to look for in the boneyard Smile

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

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Re: Looking to see if this is something we could use [message #323127 is a reply to message #323125]

Fri, 01 September 2017 18:24

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Nice thought, and it might be worth a try, but that is the pump that EPA required be put in to detect if the gas cap had been left open. That way, when the system does not stay sucked down and you are emitting as much hydrocarbon as a fur tree, the ECM can take time from doing the important jobs to set the MIL and a code for the dealer to bill you for.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: Looking to see if this is something we could use [message #323207 is a reply to message #323109]

Sat, 02 September 2017 19:40

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Then it prolly lacks sufficient capacity to be a good brake booster 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: Looking to see if this is something we could use [message #323209 is a reply to message #323109]

Sat, 02 September 2017 19:47

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

At 0.35amps, I'm sure it does not have the capacity (volume) to keep up with the brake booster requirements. That's only 4 watts of power, so I'm thinking it would take several minutes to recover after each brake application.

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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Re: Looking to see if this is something we could use [message #323211 is a reply to message #323109]

Sat, 02 September 2017 19:52

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

Also, 11" of vacuum is very low for the booster. My engine will hit double that coming off throttle when I hit the brakes, so thats only 1/2 the "power" brakes.

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