Proportioning Valves - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andy4639 · 09-29-2015, 09:15 PM

I have the rear CPP Disc kit on my 71. It has the factory disc up front. When I ordered the rear kit I got the new CPP Proportioning Valve for Disc/Disc.

My question is:

Do they make another valve with more pressure to the rears and can you find out what numbers the one I have is. I plan to call them in the morning but was wondering if any of you knew. I was told you can get 2 versions of them. Just wondering?

**Ironangel** · 09-29-2015, 09:55 PM

Yes there are a multitude of proportioning valves and since you've installed discs front and rear, there are valves designed for disc/disc application as well as MC's designed for four corner disc brakes. Kinda depends on what you want and how you want it to work. If you have a front disc, rear drum MC with a four corner disc prop. valve, you wont get the same braking effect of a later model truck with a factory four corner disc set up. You can however get an adjustable prop. valve and dial in the amount of rear to front ratio, or even get a prop. valve with independent four corner adjust-ability.(usually used for racing) Check out "The Right Stuff" get your part numbers and go shopping. I always run part numbers and names through Amazon.com because they sell the same packages as CPP, Jegs, and Summit. Check out Rock Auto too. Hard to beat they're prices and if you have "Amazon Prime" Shipping is always free and guaranteed in two days...

When you call CPP, ask for the manufacturer of the valve as well as the part number...I have a feeling you have a "Right Stuff" prop. valve...That looks like this >>-->

Andy4639 · 09-29-2015, 10:10 PM

I was told when I bought the power assit and master cylinder it was for Disc/Disc. I assume it is.

**Ironangel** · 09-29-2015, 10:28 PM

Nice! Then your problem is you dont think your getting enough rear brake? Those valves are pre-set and cant be adjusted...It is possible that you got an off the shelf valve throwed in with an in house kit? I've been reading "not so positive" feedback involving CPP kit packages...You may have to go to a different type prop. valve, maybe one with an adjust-ability like this

Note the price here then google the part number and you'll see the varying prices for the same unit.

Amazon.com: Wilwood 260-11179 Proportioning...

Andy4639 · 09-30-2015, 05:13 PM

Well I decided this morning to check the front disc and caliper. Drivers side was good, passenger side was froze wouldn't move at all. I got a replacement one and got back together. Waiting for the wife to get home to bleed them and see if that cures the problems.
I replaced the same side back in 08 so it was free from O-Reilly's.
I went a head and put some new pads on both sides as the old ones looked pretty bad.

Andy4639 · 09-30-2015, 07:47 PM

Lets try this again. Maybe the pictures will load. Drivers side looked ok but not as good as I thought they should. Passenger side was cracked and looked bad.
Both sides looked glazed over to me.
Top picture is passenger side.

09-29-2015, 09:15 PM	#1
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Proportioning Valves I have the rear CPP Disc kit on my 71. It has the factory disc up front. When I ordered the rear kit I got the new CPP Proportioning Valve for Disc/Disc. My question is: Do they make another valve with more pressure to the rears and can you find out what numbers the one I have is. I plan to call them in the morning but was wondering if any of you knew. I was told you can get 2 versions of them. Just wondering? __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

09-29-2015, 09:55 PM	#2
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Proportioning Valves Yes there are a multitude of proportioning valves and since you've installed discs front and rear, there are valves designed for disc/disc application as well as MC's designed for four corner disc brakes. Kinda depends on what you want and how you want it to work. If you have a front disc, rear drum MC with a four corner disc prop. valve, you wont get the same braking effect of a later model truck with a factory four corner disc set up. You can however get an adjustable prop. valve and dial in the amount of rear to front ratio, or even get a prop. valve with independent four corner adjust-ability.(usually used for racing) Check out "The Right Stuff" get your part numbers and go shopping. I always run part numbers and names through Amazon.com because they sell the same packages as CPP, Jegs, and Summit. Check out Rock Auto too. Hard to beat they're prices and if you have "Amazon Prime" Shipping is always free and guaranteed in two days... When you call CPP, ask for the manufacturer of the valve as well as the part number...I have a feeling you have a "Right Stuff" prop. valve...That looks like this >>--> __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American" Last edited by Ironangel; 09-29-2015 at 10:04 PM.

09-29-2015, 10:10 PM	#3
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Proportioning Valves I was told when I bought the power assit and master cylinder it was for Disc/Disc. I assume it is. Attached Images __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

09-29-2015, 10:28 PM	#4
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: Proportioning Valves Nice! Then your problem is you dont think your getting enough rear brake? Those valves are pre-set and cant be adjusted...It is possible that you got an off the shelf valve throwed in with an in house kit? I've been reading "not so positive" feedback involving CPP kit packages...You may have to go to a different type prop. valve, maybe one with an adjust-ability like this Note the price here then google the part number and you'll see the varying prices for the same unit. Amazon.com: Wilwood 260-11179 Proportioning... __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

09-30-2015, 05:13 PM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Proportioning Valves Well I decided this morning to check the front disc and caliper. Drivers side was good, passenger side was froze wouldn't move at all. I got a replacement one and got back together. Waiting for the wife to get home to bleed them and see if that cures the problems. I replaced the same side back in 08 so it was free from O-Reilly's. I went a head and put some new pads on both sides as the old ones looked pretty bad. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

09-30-2015, 07:47 PM	#6
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Proportioning Valves Lets try this again. Maybe the pictures will load. Drivers side looked ok but not as good as I thought they should. Passenger side was cracked and looked bad. Both sides looked glazed over to me. Top picture is passenger side. Attached Images __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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