Home » Public Forums » GMCnet » [GMCnet] Disable Metering Valve
| [GMCnet] Disable Metering Valve [message #298254] |
Mon, 28 March 2016 18:20  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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We're just about finished with the conversion of my son Alan's middle and
rear brakes to discs. It's now time to disable the metering valve. I
disassembled and reported on the OEM combination valve back in '07:
http://www.gmcmhphotos.com/photos/g3510-deciphering-the-combination-valve.html
The project would be easy if that were the valve on Alan's coach. It's
not. Someone before us replaced it with this one:
https://www.dropbox.com/s/ydbrky0w19s34jg/Alan%27s%20Combination%20Valve.jpg?dl=0
The combination valve is obviously still at the forward end of this one,
like the iron OEM version. However, where the OEM had a big (3/4"?) nut
retaining it, this one is much smaller (7/16"). The OEM version required
considerable force to extract the metering valve, but I wasn't concerned
about damaging it when I disassembled it. I didn't mind manhandling it.
This time, I'd like to avoid damaging anything, so I'm asking for help:
Has anyone disassembled one of these valves? If so, how do I extract the
metering valve so I can throw it away and seal its push pin hole? Does it
just pull out, like the old one? Or is there a hidden retainer which I
can't see without removing the whole thing (if you look at the condition of
the 5 brake lines in the photo, you'll see why I don't want to do that)?
Any help appreciated.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc., etc.
www.gmcwipersetc.com
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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] Disable Metering Valve [message #298261 is a reply to message #298254] |
Mon, 28 March 2016 19:53  |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Ken,
I think that this might help you. It looks like the same valve. Is it a GM valve?
http://www.classicperform.com/Instructions/PDF/Prop_Valve_Mod_Instructions.pdf
Just what I have in the records.
I also have info on a valve supplied by Carolina Classic trucks.
http://www.carolinaclassictrucks.com/71-77_Olds-442-brake-valve-1.html
Which is like the factory unit.
J.R. Wright
GMC GreatLaker
Newsletter Editor/Publisher
Tech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan
> On Mar 28, 2016, at 4:20 PM, Ken Henderson wrote:
>
> We're just about finished with the conversion of my son Alan's middle and
> rear brakes to discs. It's now time to disable the metering valve. I
> disassembled and reported on the OEM combination valve back in '07:
>
> http://www.gmcmhphotos.com/photos/g3510-deciphering-the-combination-valve.html
>
> The project would be easy if that were the valve on Alan's coach. It's
> not. Someone before us replaced it with this one:
>
> https://www.dropbox.com/s/ydbrky0w19s34jg/Alan%27s%20Combination%20Valve.jpg?dl=0
>
> The combination valve is obviously still at the forward end of this one,
> like the iron OEM version. However, where the OEM had a big (3/4"?) nut
> retaining it, this one is much smaller (7/16"). The OEM version required
> considerable force to extract the metering valve, but I wasn't concerned
> about damaging it when I disassembled it. I didn't mind manhandling it.
> This time, I'd like to avoid damaging anything, so I'm asking for help:
>
> Has anyone disassembled one of these valves? If so, how do I extract the
> metering valve so I can throw it away and seal its push pin hole? Does it
> just pull out, like the old one? Or is there a hidden retainer which I
> can't see without removing the whole thing (if you look at the condition of
> the 5 brake lines in the photo, you'll see why I don't want to do that)?
>
> Any help appreciated.
>
> Ken H.
> Americus, GA
> '76 X-Birchaven w/Cad500/Howell EFI & EBL,
> Manny Brakes & 1-Ton, etc., etc., etc.
> www.gmcwipersetc.com
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Disable Metering Valve [message #298265 is a reply to message #298254] |
Mon, 28 March 2016 20:55 |
 |
wally
Messages: 643
Registered: August 2004
Location: Omaha Nebraska
Karma: 5
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Senior Member |
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If you unscrew the 7/16 hex part you can pull out the valve and spring. If it is like my non stock one the seal is a cup washer and backing ring instead of an o-ring like original. I hear ya on removing lines and hoping to get them to seal again. Mine came apart easy. Probably looks like this.
http://www.gmcmhphotos.com/photos/power-level-valve-fitting/p60303-aftermarket-brass-combination-valve-innards.html
Ken Henderson wrote on Mon, 28 March 2016 18:20We're just about finished with the conversion of my son Alan's middle and
rear brakes to discs. It's now time to disable the metering valve. I
disassembled and reported on the OEM combination valve back in '07:
http://www.gmcmhphotos.com/photos/g3510-deciphering-the-combination-valve.html
The project would be easy if that were the valve on Alan's coach. It's
not. Someone before us replaced it with this one:
https://www.dropbox.com/s/ydbrky0w19s34jg/Alan%27s%20Combination%20Valve.jpg?dl=0
The combination valve is obviously still at the forward end of this one,
like the iron OEM version. However, where the OEM had a big (3/4"?) nut
retaining it, this one is much smaller (7/16"). The OEM version required
considerable force to extract the metering valve, but I wasn't concerned
about damaging it when I disassembled it. I didn't mind manhandling it.
This time, I'd like to avoid damaging anything, so I'm asking for help:
Has anyone disassembled one of these valves? If so, how do I extract the
metering valve so I can throw it away and seal its push pin hole? Does it
just pull out, like the old one? Or is there a hidden retainer which I
can't see without removing the whole thing (if you look at the condition of
the 5 brake lines in the photo, you'll see why I don't want to do that)?
Any help appreciated.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc., etc.
www.gmcwipersetc.com
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Unsubscribe or Change List Options:
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Wally Anderson
Omaha NE
75 Glenbrook
[Updated on: Mon, 28 March 2016 21:13] Report message to a moderator |
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| Re: [GMCnet] Disable Metering Valve [message #298266 is a reply to message #298262] |
Mon, 28 March 2016 21:15 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Because I gur-an-tee that at least one of the brake line fittings on that
40 year old valve is going to give you fits before you prevail. Been there,
done that, too many times to count.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Mar 28, 2016 6:09 PM, "Bob Heller" wrote:
> Ken,
>
> I put one of these valves on my GMC a few months ago, no metering or
> proportioning, just a pressure differential switch for the warning light.
> For $49
> why play around with the existing valve?
>
>
>
> http://www.ebay.com/itm/171700162895?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
>
>
> or search Ebay for "PROPORTIONING PROP VALVE GM, AC DELCO 172-1361 DISC
> DISC"
>
>
> --
> Bob Heller
> 1974 X-Canyonlands 26ft
> Original 455 exc for timing chain,
> Rockwell intake, valve covers. 136k miles.
> Winter Springs FL
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] Disable Metering Valve [message #298268 is a reply to message #298266] |
Tue, 29 March 2016 00:44 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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We sell several of them a month
On Mon, Mar 28, 2016 at 7:15 PM, James Hupy wrote:
> Because I gur-an-tee that at least one of the brake line fittings on that
> 40 year old valve is going to give you fits before you prevail. Been there,
> done that, too many times to count.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
> On Mar 28, 2016 6:09 PM, "Bob Heller" wrote:
>
>> Ken,
>>
>> I put one of these valves on my GMC a few months ago, no metering or
>> proportioning, just a pressure differential switch for the warning light.
>> For $49
>> why play around with the existing valve?
>>
>>
>>
>>
> http://www.ebay.com/itm/171700162895?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
>>
>>
>> or search Ebay for "PROPORTIONING PROP VALVE GM, AC DELCO 172-1361 DISC
>> DISC"
>>
>>
>> --
>> Bob Heller
>> 1974 X-Canyonlands 26ft
>> Original 455 exc for timing chain,
>> Rockwell intake, valve covers. 136k miles.
>> Winter Springs FL
>>
>> _______________________________________________
>> 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
>
--
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] Disable Metering Valve [message #298274 is a reply to message #298261] |
Tue, 29 March 2016 07:28 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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John,
Thanks for the information.
That first reference is very clear and concise about how to disable a
function. But it's amazing to me that they're disabling the PROPORTIONING
function while leaving the METERING valve! That's at least bass-ackwards
to me. The proportioning valve could conceivably be still needed with
discs-discs; the metering valve should never be used without rear drums --
IMHO and everything I read.
The second reference appears to be to exactly my valve. I've gotten
information from someone else that confirms what I'd decided -- there's
just friction holding the metering valve in place after I remove the
forward retaining nut. So, I'll remove that and devise a way to seal the
emptied chamber.
Thanks!
Ken H.
On Mon, Mar 28, 2016 at 8:53 PM, John Wright wrote:
> Ken,
> I think that this might help you. It looks like the same valve. Is it a
> GM valve?
>
>
> http://www.classicperform.com/Instructions/PDF/Prop_Valve_Mod_Instructions.pdf
>
> Just what I have in the records.
>
> I also have info on a valve supplied by Carolina Classic trucks.
>
> http://www.carolinaclassictrucks.com/71-77_Olds-442-brake-valve-1.html
>
> Which is like the factory unit.
>
>
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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] Disable Metering Valve [message #298277 is a reply to message #298254] |
Tue, 29 March 2016 08:38 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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The idea is to leave the shuttle so the failure light will alert you but remove the portion which requires a certain pressure before opening the rear line. Looks fairly easy on both types of valve. Or, you can buy the ~~50 bux switch only from the newer GM stuff and be done with it.
--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] Disable Metering Valve [message #298282 is a reply to message #298274] |
Tue, 29 March 2016 10:11 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Ken,
If everything goes wrong and you can't salvage the combo valve,
give me a call and I'll swing by Tom Hampton's and bring a set
of his stainless brake lines down with me. I don't think you can
salvage those visegrip specials you have to work with.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Ken Henderson"
Sent: Tuesday, March 29, 2016 8:28 AM
To: "GMC Mail List"
Subject: Re: [GMCnet] Disable Metering Valve
> John,
>
> Thanks for the information.
>
> That first reference is very clear and concise about how to disable a
> function. But it's amazing to me that they're disabling the PROPORTIONING
> function while leaving the METERING valve! That's at least bass-ackwards
> to me. The proportioning valve could conceivably be still needed with
> discs-discs; the metering valve should never be used without rear drums --
> IMHO and everything I read.
>
> The second reference appears to be to exactly my valve. I've gotten
> information from someone else that confirms what I'd decided -- there's
> just friction holding the metering valve in place after I remove the
> forward retaining nut. So, I'll remove that and devise a way to seal the
> emptied chamber.
>
> Thanks!
>
> Ken H.
>
> On Mon, Mar 28, 2016 at 8:53 PM, John Wright wrote:
>
>> Ken,
>> I think that this might help you. It looks like the same valve. Is it a
>> GM valve?
>>
>>
>> http://www.classicperform.com/Instructions/PDF/Prop_Valve_Mod_Instructions.pdf
>>
>> Just what I have in the records.
>>
>> I also have info on a valve supplied by Carolina Classic trucks.
>>
>> http://www.carolinaclassictrucks.com/71-77_Olds-442-brake-valve-1.html
>>
>> Which is like the factory unit.
>>
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Disable Metering Valve [message #298314 is a reply to message #298254] |
Tue, 29 March 2016 21:13 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Thanks, Everyone, for all the help. Alan, along with his friend (who was
an employee of mine in the computer store 25 years ago), came today and we
finished the disc brake installation. The disabling of the metering valve
was the easiest part of the whole job. Here are some photos of that mod:
https://www.dropbox.com/sh/fak8nkgtjbmyakr/AACl1rTMqgelYYfRI5MWvJsra?dl=0
Unfortunately, I lost the final photo, made after I sealed the washer and
screw with JBWeld, cut the screw short and covered the whole thing with
JBWeld before screwing the retainer back into the valve body. It's not
likely to ever leak or come apart again. I hope.
The only difficulties with the installation arose because Alan decided he
didn't want to use the old calipers I had on hand. The calipers we
installed were apparently not rebuilt but new because the inside of the
bridges (the part spanning the disc to connect the inner and outer portions
of the caliper) was too close to the disc -- on some we actually had
contact between the disc and the bridge. A 7" body grinder with a grinding
wheel fixed that after a few "grind and try" efforts on each caliper. It
turned out that the circumferences of a couple of the discs were not
perfectly round either, causing intermittent contact between them and the
bridges. An improvised lathe (consisting of that body grinder stabilized
on 4"x4" blocks adjacent to the manually rotated, spindle-mounted, rotors)
quickly corrected those flaws.
I just talked to Alan after his 80 mile trip home. He made it with good
brakes. The one disc which was a little more difficult to turn than we
liked had freed up and cooled down when he arrived. He'll probably need to
bleed the brakes again later (we didn't touch the fronts even though we
replaced the MC), but he has a pretty good pedal. With the Lenzi
sensitized booster I gave him, the pedal pressure is not excessive, even
with the 34mm MC.
I'm TARRED after that day's work!!!
Ken H.
On Mon, Mar 28, 2016 at 7:20 PM, Ken Henderson
wrote:
> We're just about finished with the conversion of my son Alan's middle and
> rear brakes to discs. It's now time to disable the metering valve.
>
...
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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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