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Unread 05-04-2013, 09:52 PM   #1
Alex77cj7
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77 cj7 prop valve?

Hey,
I have been having problems with my brakes and cant seem to figure it out. They pull when i brake but its almost never the same way twice in a row. I can't seem to lock up the wheels or brake really fast. I swapped to a jeep cherokee xj booster and master cylinder but kept the "stock" proportioning valve. It was doing this pulling before this swap and still is. I was thinking maybe my prop valve was going bad but i dont know how to tell. I've been searching for a 1977 cj7 prop valve but cant seem to find any for sale at several different sites. Was my jeep supposed to have one?
Also i've heard of people removing them completely but cant seem to find any write ups on it. How is this done? and what lines hook to what?
Has anyone else done this swap and had these problems?
What did yall use with yalls swap?

Any help is greatly appreciated!
Thanks,
Alex

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Unread 05-04-2013, 09:55 PM   #2
Alex77cj7
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I was planning on trying to work on this and fix it tomorrow on my day off so any and all help is greatly appreciated.
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Unread 05-05-2013, 11:42 AM   #3
John Strenk
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Do you have disk/drum setup?

When I put disks on my 76 I used an 84 combination valve.

Not sure if it matter if you search for a proportioning valve or combination valve as the proportioning is just one part of all the things going on.

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Unread 05-05-2013, 11:54 AM   #4
Alex77cj7
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Quote:
Originally Posted by John Strenk
Do you have disk/drum setup?

When I put disks on my 76 I used an 84 combination valve.

Not sure if it matter if you search for a proportioning valve or combination valve as the proportioning is just one part of all the things going on.

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No I have drums front and rear.
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Unread 05-05-2013, 12:06 PM   #5
Alex77cj7
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I've tried searching for both. I figured I'd try to remove it today and see how it does. I just don't know what hooks to what. And what thread the line nuts are so I can get connectors..
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Unread 05-05-2013, 12:09 PM   #6
Dngrs1
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My .02. As the prop valve controls fluid distribution front and rear, I doubt that it could cause pulling side to side. I would be more inclined to check front end components; shoes, drums, spindle bearings, ball joints, steering ends, steering gear mounting, etc. Just for comparison, I am also running 33" tires and a 4" lift and I can't "lock up" my tires either (unless on dirt or gravel) and I am running front disc and rear drum.
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Unread 05-05-2013, 12:16 PM   #7
Alex77cj7
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Quote:
Originally Posted by Dngrs1
My .02. As the prop valve controls fluid distribution front and rear, I doubt that it could cause pulling side to side. I would be more inclined to check front end components; shoes, drums, spindle bearings, ball joints, steering ends, steering gear mounting, etc. Just for comparison, I am also running 33" tires and a 4" lift and I can't "lock up" my tires either (unless on dirt or gravel) and I am running front disc and rear drum.
Well I noticed online a picture brake down of the cj7 prop valve and it does have a left front, right front, and rear outputs. I'm running 33's with a spring over and a Cherokee dual diaphragm booster.
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Unread 05-05-2013, 12:23 PM   #8
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image-2564986827.jpg



image-1172711493.jpg
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Unread 05-05-2013, 02:27 PM   #9
Dngrs1
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From the '76 TSM, section 9, courtesy of http://oljeep.com/gw/76_tsm/Section9.pdf
"The proportioner section provides balanced front to rear braking during high speed stops. At high deceleration, rear weight is transferred to the front wheels and must be compensated for to avoid early rear wheel skid. The proportioner section of the valve reduces initial line pressure to the rear wheels, delaying rear brake lockup and avoiding early rear wheel skid.
The proportioner does not operate during normal or light brake application."

So although there are two lines coming from the proportioner to the front, the proportioner does not regulate pressure left/right. There is also, on page 8, a troubleshooting section on brakes pulling/ grabbing for front and rear drum brakes.
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Unread 05-05-2013, 02:40 PM   #10
Alex77cj7
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Quote:
Originally Posted by Dngrs1
From the '76 TSM, section 9, courtesy of http://oljeep.com/gw/76_tsm/Section9.pdf
"The proportioner section provides balanced front to rear braking during high speed stops. At high deceleration, rear weight is transferred to the front wheels and must be compensated for to avoid early rear wheel skid. The proportioner section of the valve reduces initial line pressure to the rear wheels, delaying rear brake lockup and avoiding early rear wheel skid.
The proportioner does not operate during normal or light brake application."

So although there are two lines coming from the proportioner to the front, the proportioner does not regulate pressure left/right. There is also, on page 8, a troubleshooting section on brakes pulling/ grabbing for front and rear drum brakes.
I wasn't thinking that is was distributing it wrong but that there may be something inside clogging one hole that moves around. It sometimes doesn't pull, pulls right soft or hard, and left soft or hard.
Is mine supposed to have one a prop valve? I still can't find one for sale for my year with drums.
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Unread 05-05-2013, 02:42 PM   #11
Alex77cj7
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Quote:
Originally Posted by Dngrs1
From the '76 TSM, section 9, courtesy of http://oljeep.com/gw/76_tsm/Section9.pdf
"The proportioner section provides balanced front to rear braking during high speed stops. At high deceleration, rear weight is transferred to the front wheels and must be compensated for to avoid early rear wheel skid. The proportioner section of the valve reduces initial line pressure to the rear wheels, delaying rear brake lockup and avoiding early rear wheel skid.
The proportioner does not operate during normal or light brake application."

So although there are two lines coming from the proportioner to the front, the proportioner does not regulate pressure left/right. There is also, on page 8, a troubleshooting section on brakes pulling/ grabbing for front and rear drum brakes.
Thanks for the help, ill read up on all of that.
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Unread 05-05-2013, 02:48 PM   #12
Dngrs1
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Well, start at item #49.
http://www.jeep4x4center.com/jeep-br...bler/index.htm
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Unread 05-05-2013, 05:33 PM   #13
John Strenk
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the one you want looks more like this.



this is not for a jeep so i can't vouch for the dimensions.

a drum/drum combination valve only does proportioning to the rear and a safety valve in case you loose brakes front or rear.
a disk/drum combination valve also has a metering valve for the front disks.
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