Where can I get a proportioning valve? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BigRed76 · 06-12-2011, 10:38 PM

I recently diagnosed a bad proportioning valve on my '76 and have been searching the internet for a new one (since part stores say they can't get one), and the only prop. valves I can find are for GM cars. Does anyone know where I can get a new proportioning valve for our trucks??

SCOTI · 06-12-2011, 11:47 PM

Quote:

Originally Posted by BigRed76

I recently diagnosed a bad proportioning valve on my '76 and have been searching the internet for a new one (since part stores say they can't get one), and the only prop. valves I can find are for GM cars. Does anyone know where I can get a new proportioning valve for our trucks??

Inline Tubing has exact replacements in brass or aluminum.

BigRed76 · 06-13-2011, 12:12 AM

I did not see any replacement proportioning valves in thier catalog for any GM trucks newer than '70.

SCOTI · 06-13-2011, 12:28 AM

Quote:

Originally Posted by BigRed76

I did not see any replacement proportioning valves in thier catalog for any GM trucks newer than '70.

http://www.inlinetube.com/Prop%20Valves/VCT104.htm
http://www.inlinetube.com/Prop%20Valves/VCT105.htm
http://www.inlinetube.com/Prop%20Valves/VCT103.htm

BigRed76 · 06-13-2011, 12:35 AM

Thank you for the links. They do not specify, but do you know if theres a difference between 2wd and 4wd?

SCOTI · 06-13-2011, 11:05 AM

Quote:

Originally Posted by BigRed76

Thank you for the links. They do not specify, but do you know if theres a difference between 2wd and 4wd?

I don't believe so. From what I can tell, the design is based on disc/drum or disc/disc applications. I would give them a call for specifics to be sure.

Pyrotechnic · 06-13-2011, 11:34 AM

Years ago I was able to get one from a parts shop that dealt with AC Delco brand parts. The usual chain auto parts stores didn't have the valve at that time either.

**Corts60** · 06-13-2011, 02:46 PM

Google dans classics in Portland Oregon. I just bought one from for $60 about two months ago. He had it sitting on the shelf. It was made by cpp
Posted via Mobile Device

SCOTI · 06-13-2011, 03:15 PM

Quote:

Originally Posted by Corts60

Google dans classics in Portland Oregon. I just bought one from for $60 about two months ago. He had it sitting on the shelf. It was made by cpp
Posted via Mobile Device

Is it the adjustable unit? If so, it's not a direct swap. Brake line fittings are sized differently in a couple of ports.

BigRed76 · 06-13-2011, 11:33 PM

Quote:

Originally Posted by SCOTI

Is it the adjustable unit? If so, it's not a direct swap. Brake line fittings are sized differently in a couple of ports.

Thats what I noticed about the CPP prop valves for GMs. They have the 3/8s threads for the two front lines which fits the cars, but not the trucks.

**Corts60** · 06-14-2011, 12:06 AM

Nope, it was a direct replacement; solid brass. All I did was call him and ask for a proportioning valve for a 1978 chevy 1/2 ton. Bolted right up.

06-12-2011, 10:38 PM	#1
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Where can I get a proportioning valve? I recently diagnosed a bad proportioning valve on my '76 and have been searching the internet for a new one (since part stores say they can't get one), and the only prop. valves I can find are for GM cars. Does anyone know where I can get a new proportioning valve for our trucks?? __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB Last edited by BigRed76; 06-12-2011 at 10:38 PM.

06-13-2011, 12:12 AM	#3
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: Where can I get a proportioning valve? I did not see any replacement proportioning valves in thier catalog for any GM trucks newer than '70. __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

06-13-2011, 12:35 AM	#5
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: Where can I get a proportioning valve? Thank you for the links. They do not specify, but do you know if theres a difference between 2wd and 4wd? __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

06-13-2011, 11:34 AM	#7
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: Where can I get a proportioning valve? Years ago I was able to get one from a parts shop that dealt with AC Delco brand parts. The usual chain auto parts stores didn't have the valve at that time either. __________________ 1977 GMC Sierra Grande

06-13-2011, 02:46 PM	#8
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Where can I get a proportioning valve? Google dans classics in Portland Oregon. I just bought one from for $60 about two months ago. He had it sitting on the shelf. It was made by cpp Posted via Mobile Device __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

06-14-2011, 12:06 AM	#11
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Where can I get a proportioning valve? Nope, it was a direct replacement; solid brass. All I did was call him and ask for a proportioning valve for a 1978 chevy 1/2 ton. Bolted right up. __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)



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