Proportioning Valve photos Disassembled

[dkroth]

I cleaned my proportioning valve over the weekend. It was packed full of crusty crap. Unfortunately, even after cleanup rear lockup is only marginally improved. I'm going to be looking at a Wilwood valve soon, I guess. I like to keep things stock but rear lockup is a good reason to go aftermarket!

Also, my valve is the same style as carreta's as pictured above. Before pictures only.

 

[honk]

Well, my brakes work under normal circumstances, and I've bled it without any trouble. However, whenever I have to stop in a hurry, I always hear skidding tires sound in the rear. I thought that was normal until I read about proportioning valves.

I wouldn't assume from hearing rear wheel skidding upon braking that a proportioning valve is faulty. It's not so cut and dried as that.

Rear skids on braking can occur on any vehicle which transfers the biggest part of its weight forward when slowed, particularly a short wheelbase vehicle as is an FJ40.

The amount of tire traction has an effect on whether the rear skids or not as well Tires with harder rubber compounds breaking loose before softer versions.

So while a nice clean proportioning valve can't be a bad thing, going to lengths to be sure that the valve is optimal may not result in a noticeable improvement in braking characteristics at all.

 

[Racer65]

In my case that was the problem. As you probably know I turned the solution into a product, and the Cruiser stops with complete poise now. I've since been in at least 3 occasions involving very hard stops and there's absolutely no skidding.

 

[honk]

In my case that was the problem. As you probably know I turned the solution into a product, and the Cruiser stops with complete poise now. I've since been in at least 3 occasions involving very hard stops and there's absolutely no skidding.

Which product, as you may or may not recall, I've been using with complete success in the four wheel disc brake system installed on my '77 truck.

 

[Racer65]

Which product, as you may or may not recall, I've been using with complete success in the four wheel disc brake system installed on my '77 truck.

Oh yeah! That was a few hard stops ago.

 

[Dudleyfj40]

I'm so glad I found this thread! I had rears locking up also. Removed, cleaned the stock LSPV, no more rear skids. Thanks!
Note: indicators of corrosion, I had dark colored fluid in my rear reservoir.

 

[Buffchief]

I took my proportioning valve apart because the rear drum brakes were locking up before the front discs. After cleaning all the rusty looking sediment off the internals, and brushing the inside of the housing with a brass shotgun brush, the brakes are much more reliable. Still not sure how it actually functions, but it does. I did notice that the rubber boot on the shaft seemed to fit loosely but it looks like it was made that way. Also, the disassembly went more smoothly when I clamped the big nut in the vise and turned the valve housing with a big Crescent wrench. Since I had not been able to find a photo of the internals on this site, I thought someone else might like to know what is inside.
View attachment 731529View attachment 731530

I took my proportioning valve apart because the rear drum brakes were locking up before the front discs. After cleaning all the rusty looking sediment off the internals, and brushing the inside of the housing with a brass shotgun brush, the brakes are much more reliable. Still not sure how it actually functions, but it does. I did notice that the rubber boot on the shaft seemed to fit loosely but it looks like it was made that way. Also, the disassembly went more smoothly when I clamped the big nut in the vise and turned the valve housing with a big Crescent wrench. Since I had not been able to find a photo of the internals on this site, I thought someone else might like to know what is inside.
View attachment 731529View attachment 731530

Just what I needed! Thanks

 

[Engineer8000]

I rebuilt mine a few years ago.

Proportioning valve restoration

I obtained this a while back (thanks @65swb45) Tore it apart and cleaned it out, replaced the piston and u-cup seals with the kit from Muscle Car Research. Cleaned up the rusted end caps, tried my hand at home Ni and Cu plating (Instructables.com), I think they turned out pretty good...

forum.ih8mud.com

 

[Buffchief]

Looks great! I just ordered the kit as well. Great find!

I rebuilt mine a few years ago.

https://forum.ih8mud.com/threads/proportioning-valve-restoration.1216118/[/URL

http://

 

[77mustard40]

Do it, here’s what mine looked like 12+ years ago.

 

[Buffchief]

Do it, here’s what mine looked like 12+ years ago.

View attachment 3778393

One question.....does that one was here go on top s or bottom sill? Mine blew apart when pulled that big end cap/screw off!

 

[77mustard40]

That was 12 years ago and I’ve slept since then, let me look in the morning to see if I can answer your question.

 

[Buffchief]

That was 12 years ago and I’ve slept since then, let me look in the morning to see if I can answer your question.

It's ok, I'll figure it out