Proportioning Valve Question - Chevelle Tech
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post #1 of 15 (permalink) Old Nov 17th, 17, 5:18 PM Thread Starter
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Jerry
 
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Proportioning Valve Question

I need to install a proportioning valve in my 1971. It was originally a 4 wheel drum car. Now C5 calipers in the front. Decided I'm going to use:
https://www.summitracing.com/parts/wil-260-10922
The question is can I plumb this in line going to the stock distribution block leaving it in place?
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post #2 of 15 (permalink) Old Nov 17th, 17, 6:28 PM
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Re: Proportioning Valve Question

hello jerry go look at ground up site they have a original prop valve disc drum Part #FPR-102, now it should work fine
let us know how its going happy motoring

lou
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post #3 of 15 (permalink) Old Nov 17th, 17, 8:23 PM Thread Starter
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Re: Proportioning Valve Question

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Originally Posted by roadster601 View Post
hello jerry go look at ground up site they have a original prop valve disc drum Part #FPR-102, now it should work fine
let us know how its going happy motoring
Are the adjustable valves not the way to go? Thought they seem pretty straight forward to install and adjust.
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post #4 of 15 (permalink) Old Nov 18th, 17, 11:11 AM
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Re: Proportioning Valve Question

You will most definitely need an adjustable proportioning valve with your c5 caliper swap. The stock type non adjustable proportioning valve will not work well enough for you. Iím guessing you want to retain the stock chassis mount distribution block in line to make your install easier with less modifications?

Joe

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post #5 of 15 (permalink) Old Nov 18th, 17, 11:46 AM
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Re: Proportioning Valve Question

joe tell us why you need a adjustable valve unless you take a pressure ballance test on your brakes that will tell you what you need to do hyd is hyd hyd is like current path of least resistance large front brake/ weight down force on brake apply more fluid if brakes lock up then go with it

lou
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post #6 of 15 (permalink) Old Nov 18th, 17, 11:50 AM
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Re: Proportioning Valve Question

hey jerry why would you go with a C- 5 calipers

lou
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post #7 of 15 (permalink) Old Nov 18th, 17, 1:21 PM
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Re: Proportioning Valve Question

Lou,

Weight transfer with better brakes as well as maintaining that 70/30 split. Iím going with C5 fronts and rears and Iíve been advised by the vendor to install an adjustable proportioning valve to be able to fine tune the bias.

Why am I going with c5ís? Firstly because c6 need 18 or better wheel diameter and Im not willing to go that large and secondly (more importantly) ease of getting parts from anyone just about anywhere.

Joe

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post #8 of 15 (permalink) Old Nov 18th, 17, 4:38 PM
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Re: Proportioning Valve Question

I would think the apv can go in the line running to the dist block. After all, the rear line just goes into and then out of the block on its way to the rear. I have fromt C5's on my Bel Air with no adj valve and rear drums currently with no issues. When I do the rear disc upgrade, I'll add the valve.

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post #9 of 15 (permalink) Old Nov 18th, 17, 4:40 PM
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Re: Proportioning Valve Question

I've always just added an APV mid frame on the rear line.
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post #10 of 15 (permalink) Old Nov 18th, 17, 11:51 PM
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Re: Proportioning Valve Question

Don't forget the metering valve on the front line..

https://www.speedwaymotors.com/Brake...SABEgLxvfD_BwE
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post #11 of 15 (permalink) Old Nov 19th, 17, 6:08 AM
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Re: Proportioning Valve Question

If you are adding a APV why would you leave the distribution block? I am in the middle of redoing my brakes and will be putting the Wilwood adjustable valve right below my MC. There will be no other valves or blocks in the system.
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post #12 of 15 (permalink) Old Nov 19th, 17, 10:40 AM Thread Starter
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Re: Proportioning Valve Question

Quote:
Originally Posted by Pats70ss View Post
If you are adding a APV why would you leave the distribution block? I am in the middle of redoing my brakes and will be putting the Wilwood adjustable valve right below my MC. There will be no other valves or blocks in the system.
I was thinking I would leave it because the warning light sender is in the block.
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post #13 of 15 (permalink) Old Nov 19th, 17, 1:08 PM
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Re: Proportioning Valve Question

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Originally Posted by Baldfart View Post
I was thinking I would leave it because the warning light sender is in the block.

Wilwood prop valve has a spot for that s well
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post #14 of 15 (permalink) Old Nov 19th, 17, 7:35 PM
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Re: Proportioning Valve Question

In another thread, I asked if the distribution valve would be an issue down stream of an adjustable proportioning valve. I had planned on using the block as the stock junction port for the lines while retaining the brake warning light feature. I wondered if the different pressure values after the proportioning valve would cause the sensor in the distribution block to move and give a false positive. The consensus was thatís exactly what would happen. The verdict? Ditch the distribution block and get a good proportioning valve.
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post #15 of 15 (permalink) Old Nov 19th, 17, 9:56 PM Thread Starter
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Re: Proportioning Valve Question

Quote:
Originally Posted by Kopfjaeger View Post
In another thread, I asked if the distribution valve would be an issue down stream of an adjustable proportioning valve. I had planned on using the block as the stock junction port for the lines while retaining the brake warning light feature. I wondered if the different pressure values after the proportioning valve would cause the sensor in the distribution block to move and give a false positive. The consensus was thatís exactly what would happen. The verdict? Ditch the distribution block and get a good proportioning valve.
Hadn't considered it from that perspective. After thinking about it I think that it would be a good idea to ditch it.

Thanks everybody for all the input. You are all great!
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