| Propotioning valve [message #179438] |
Tue, 07 August 2012 17:14  |
ricogomez
Messages: 19
Registered: July 2008
Location: Houston, Texas
Karma: 0
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Junior Member |
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Hello, I read somewhere on the net that somebody
suggested to bypass the proportional valve, when
insstalling rear disk brakes on all 4, need input Please........ 
Rico Gomez
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| Re: [GMCnet] Propotioning valve [message #179448 is a reply to message #179438] |
Tue, 07 August 2012 18:44  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Rico,
You don't need the metering valve function of the combination valve, but
you should retain the differential pressure switch. Here's how I did it:
http://www.gmcmhphotos.com/photos/g3510-deciphering-the-combination-valve.html
or
http://goo.gl/GmwiQ
Ken H.
On Tue, Aug 7, 2012 at 6:14 PM, Rico Gomez wrote:
>
>
> Hello, I read somewhere on the net that somebody
> suggested to bypass the proportional valve, when
> insstalling rear disk brakes on all 4, need input Please........ 8o
> --
>
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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] Propotioning valve [message #179452 is a reply to message #179451] |
Tue, 07 August 2012 19:24 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Yes, I misspoke. I should have said that it allows flow to the rear first.
"If you post enough replies you are bound to be wrong once in a while" :)
Emery Stora
On Aug 7, 2012, at 6:18 PM, "A." <markbb1@netzero.com> wrote:
>
>
> emerystora wrote on Tue, 07 August 2012 18:24
>> I left mine in and it works just fine. It really isn't a proportioning valve. GM called it a Combination Valve. It does not proportion the pressure to the front and read. See 2 below.
>>
>> 1. It has a sliding piston that moves to shut off the fluid to either the front or rear if there is a pressure loss (leak).
>>
>> 2. It allows flow to the front fo start the front calipers but when the pressure reaches about 200 or 300 psi (I have forgotten the pressure) it then allows full pressure to both the front and rear. So there is no proportioning.
>>
>> Emery Stora
>> 77 Kingsley
>> Frederick, CO
> You scared me for a second with 2 above. But I felt better when I read Ken H's explanation: "To delay operation of the disc brakes, the metering valve does not open until line pressure has risen enough to take up the clearances in the drum brakes."
> If the front brakes engage before, or instead of, the rears, you have a greatly increased chance of the the vehicle spinning end for end in slick road conditions. Bad enough in a passenger car, even more terrifying in a 12,000 pound hotrod with plumbing.
> --
> '73 23' CanyonLands
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| Re: [GMCnet] Propotioning valve [message #179622 is a reply to message #179620] |
Thu, 09 August 2012 00:06 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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I found that picture somewhere and figger'd it would save us a lot of time explaining how the damn thing worked every time somebody
new had a problem by copying it and the info out of the MM.
Regards,
Rob "Master of Plagarism" M.
PS - learned how it worked from YOUR photos BEFORE I found this one!
-----Original Message-----
From: Ken Henderson
Someone's been busy with magic markers! :-)
If I'd had that, I probably wouldn't have had to "decipher" mine.
Ken H.
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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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