Proportioning valve

[LostMy65]

I just noticed that SCOTI has the Front Right and Left opposite of the pic I posted.

Originally Posted by SCOTI

1) Front pass side
2) Front driver side
3) Supply from master cyl to fronts
4) Supply from master cyl to rear
5) Rear common

Originally Posted by LostMy65

This Pic helped me:

Posted via Mobile Device

[SCOTI]

Originally Posted by LostMy65

I just noticed that SCOTI has the Front Right and Left opposite of the pic I posted.

How my prop valve is tagged is how they were plumbed in the truck. The proportioning is equal between L & R; just F & R is different so the fronts are actually interchangeable.

[LostMy65]

Looking at Parts Stores, it looks like combination valves aren't necessarily vehicle specific?
http://www.summitracing.com/parts/CLP-PV-2/

[ironman3452]

I thought that you only need a propportioning valve, if you are useing disk brakes, my 64 C 30 panel has standerd brakes, please advise if i am wrong, Iwant to change to a duel master cylinder.
thanks

[Keith Seymore]

You are correct.

If you have four drums then you only need a "distribution block" and to tie into the rear system. The proportioning will take place via the wheel cylinder sizes.

K

[rodstored-72]

This is nice information guys. I am in the process of "re-doing" a 1986 2wd (in the build section) and I am wondering as to why the proportioning valve is located on the brace in front of the motor? I would like to know if the valve can be relocated somewhere else?? I was thinking of replacing my booster and master with a later (mid '90's version) and placing the prop. valve next to the master with the lines relocated correctly. what do you guys think??

thanks!!

[Keith Seymore]

Originally Posted by rodstored-72

I would like to know if the valve can be relocated somewhere else??

Yes - the prop valve can be placed anywhere (provided it is still plumbed correctly) and in any orientation.

Originally Posted by rodstored-72

why the proportioning valve is located on the brace in front of the motor?

Seemed like a good idea at the time...

(lol)

K

[rodstored-72]

Keith,
i was hoping that you might return a chime in... !! I figured that it could be relocated, I had done the same on my '72. When I saw the location of it I was like.... ?? it seems like that is a weird spot? especially if it needs to be serviced or replaced. Now I just need to see how I will run my lines to the new location... Hmmmmm?
thanks for the reply... I feel honored to have a response from you... very similar to getting a response from ken (N2TRUX)... !!

[Dleslie212]

Reviving this thread and hoping to find an answer.

I just converted my 77 to hydro boost, with a new master cylinder and adjustable proportioning valve, which is mounted just beside the master cylinder.

My question is - can I just remove the old proportioning valve and tee the front lines together, and coupling the rears together since I'm using a new proportioning valve now? Or am I supposed to leave the old valve in place anyway?

[1957 Chief]

Originally Posted by Dleslie212

Reviving this thread and hoping to find an answer.

My question is - can I just remove the old proportioning valve and tee the front lines together, and coupling the rears together since I'm using a new proportioning valve now? Or am I supposed to leave the old valve in place anyway?

Yes, you can get rid of it. I got rid of mine when I put my adjustable prop valve in.

Bubba

[Dleslie212]

Originally Posted by 1957 Chief

Yes, you can get rid of it. I got rid of mine when I put my adjustable prop valve in.

Bubba

How did you connect the lines back together where the old prop valve was?

[1957 Chief]

Originally Posted by Dleslie212

How did you connect the lines back together where the old prop valve was?

I don't remember exactly, but I pulled the original prop valve and marked which lines were for the front and rear brakes and which ones were from the master cylinder. Then had to tee the lines together. Pretty sure I had to cut some of the flares off and put on diff size flare nuts to make it work. Wasn't that hard, its just a bear cause of where the valve is located.

Bubba