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Old 02-18-2008, 08:56 AM
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GM PROPORTIONING VALVE wiring

On GM P/U's, what is the electrical wire used for on the PROPORTIONING VALVE, and where is it fed from ?

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Old 02-18-2008, 09:04 AM
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There is no wire on a proportioning valve.
A combination valve, however, does have a terminal for a wire.
The wire comes from the brake system warning light in your gauge panel, and is to hooked to the switch in the combination valve that makes contact when the internal piston shifts to one side. The spool shifts only when there is a loss of pressure in one side of the system.

Here is a pic I linked to on the Fordification site that shows the function of the piston/switch in a plain distribution block..the combination valve with switch operates exactly the same way.

.


There is no need for the wire to be hooked up for the combination valve to function.

Hope this helps,
Mikey
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Last edited by powerrodsmike; 02-18-2008 at 09:15 AM. Reason: picture and clarity
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Old 02-18-2008, 09:19 AM
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Ok,,, I am lost, can you explain the purpose of the valve please
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Old 02-18-2008, 09:35 AM
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I thought you wanted to know what the wire was for.

You called your valve a proportioning valve.


This is a proportioning valve..
http://www.v8power.net/christian/ima...ke%20valve.jpg

What is commonly known as a proportioning valve has one function..to regulate the rate of increse of output line pressure in relation to input pressure. A proportioning valve has no place to connect a wire.

If you are asking what the wire does on a GM pickup, (and the basic operation is the same for fords and gm and dodges), then you are referring to a combination valve.




It has a connection for a wire, with a piston and switch needed,
It has a proportioning valve built in, and a disc/drum combination valve has a metering valve for proper regulation and timing of front disc brakes.

The disc/disc combination valve has no metering valve.
Here is a page that might help.

http://auto.howstuffworks.com/master-brake2.htm

It explains the 3 main functions of a typical disc/drum combination valve.


Later, mikey
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Old 02-18-2008, 09:38 AM
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Now I am very confused...
this site names it the proportioning valve...
Help.. more help
where on mid 70's Chevy P/U's is the Proportioning valve located, one in the diagram below is under the radiator.

http://www.classicperform.com/Instructions/PDF/PVK.pdf
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Old 02-18-2008, 09:43 AM
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It is not named correctly on the CPP site. (I am finding that those guys have a lot of issues like that)

That is a combination valve. That page even lists the 4 functions.
They probably are calling it a proportioning valve because that is what many people mistakenly call them.

Mine is located on the crossmember under the radiator also, (73 blazer)




See my above post for further clarification on why it should not be called a proportioning valve..


Either way, the wire performs the same function as what I stated in my first post.

The function and hookup of the wire is explained in the page you linked to.


Mikey
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Old 02-18-2008, 10:06 AM
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Thank YOU Mike...

where on mid 70's Chevy P/U's is the Proportioning valve located, one in the diagram below is under the radiator. If this valve is not a Proportioning valve, where is it ?
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Old 02-18-2008, 10:16 AM
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On a mid 70's chevy pickup, look for the valve that has all of the brake lines from the master cylinder going to it, and the lines going out to the front and rear brakes ...that is the combination valve in question.

Call it what ever makes you feel good, or keeps things straight in yur mind.....

It might be on the crossmember under the radiator..my 78 had it there and my 73 has it there.


The physical location of that valve does not matter, as long as it is plumbed correctly.

Later, mikey
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Old 02-18-2008, 10:20 AM
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Think I am getting it now...
combination valve... pressure valve for the switch and proportioning valve in one , correct ?
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Old 02-18-2008, 10:31 AM
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Quote:
Originally Posted by dar130
Think I am getting it now...
combination valve... pressure valve for the switch and proportioning valve in one , correct ?


Yes you are getting it now.

My written communication does not always work right.

Later, mikey
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Old 02-18-2008, 05:55 PM
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thank YOU.. Mike... !!

Guys like YOU make this site !

maybe one day, I can share something also
Darele
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