Yet another Proportioning Valve? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70GMCer · 04-04-2008, 03:30 PM

Is there a difference between a 3/4T & 1/2T Proportioning Valve?

In my assembly manual, it shows 2 different brake line routings from the ms to the prop valve, but does not mention if the valve itself is different or not.

Would that only depend on if you got a 1/2T ms or a 3/4T ms, would those lines run different? The one I have came off a working 71 3/4T and the valve looks the same as one from a 1/2T.

Hope that isn't too confusing. I need to know this before bleeding the new disk brake swap.

Here's a picture of the valve I'm using.

70GMCer · 04-04-2008, 10:32 PM

anyone??

Eichorst69 · 04-04-2008, 10:40 PM

Proportioning valves are the same. The brake line routing from the master to the valve are just the opposite on 3/4's & 1/2's. I just went through this with my 69 3/4 disk swap.

Rob

70GMCer · 04-05-2008, 03:13 PM

That's what I thought, but wanted to double check....thanks....

dieselarmy13 · 04-05-2008, 04:31 PM

Damn, 70, didn't you start this like a whole week ago? What's taking so long?

70GMCer · 04-05-2008, 05:23 PM

Planning my son, planning......or, you can't rush an art form......

04-04-2008, 03:30 PM	#1
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Yet another Proportioning Valve? Is there a difference between a 3/4T & 1/2T Proportioning Valve? In my assembly manual, it shows 2 different brake line routings from the ms to the prop valve, but does not mention if the valve itself is different or not. Would that only depend on if you got a 1/2T ms or a 3/4T ms, would those lines run different? The one I have came off a working 71 3/4T and the valve looks the same as one from a 1/2T. Hope that isn't too confusing. I need to know this before bleeding the new disk brake swap. Here's a picture of the valve I'm using. Attached Images __________________ 1997 GMC Sierra Ext 1965 Mustang

04-04-2008, 10:32 PM	#2
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Yet another Proportioning Valve? anyone?? __________________ 1997 GMC Sierra Ext 1965 Mustang

04-04-2008, 10:40 PM	#3
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: Yet another Proportioning Valve? Proportioning valves are the same. The brake line routing from the master to the valve are just the opposite on 3/4's & 1/2's. I just went through this with my 69 3/4 disk swap. Rob

04-05-2008, 03:13 PM	#4
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Yet another Proportioning Valve? That's what I thought, but wanted to double check....thanks.... __________________ 1997 GMC Sierra Ext 1965 Mustang

04-05-2008, 04:31 PM	#5
dieselarmy13 Phone's ringin Dude. Join Date: Mar 2007 Location: Colorado Springs Posts: 1,426	Re: Yet another Proportioning Valve? Damn, 70, didn't you start this like a whole week ago? What's taking so long? __________________ I pitty the fool with only two headlights!! 2003 SILVERADO SS--THE NEW GIRL 1972 GMC--THE OLD GIRL

04-05-2008, 05:23 PM	#6
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: Yet another Proportioning Valve? Planning my son, planning......or, you can't rush an art form...... __________________ 1997 GMC Sierra Ext 1965 Mustang



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