I did a search and looked through the first 100 or so results, but didn't find anything that specifically related to the early (82 ish), non-metric, proportioning valve.

These (iron?) valves are VERY different from the later aluminum valves.

Ideally I'm looking for something like this description of the later valves.https://www.thirdgen.org/forums/brak...lve-video.html

Specifically, I want to know what the single spring loaded valve does. The single spring loaded valve appears to work on the rear brakes only.

This picture shows the early style prop valve that is original equipment on my '82 Camaro. Note the part pointing DOWN, just behind where the rear brake line comes out of the front of the "valve."


Here is what came out of that section of the "Valve" which points down and is just behind where the rear brake line comes out.


Does anyone know,specifically, the purpose of this piston?

 

I've been doing more research and it looks like this piston probably is the proportioning
valve.

Most of what I have seen seems to suggest that there is a "hold off" section in the back of this piece. I'll go look at it more closely this afternoon.

 

I took a closer look and there is no second "valve"/piston in the back. Just the one in the front.

Is it a proportioning valve or a metering valve? I'm not totally sure. Based on it's location, I suspect that it is a proportioning valve. Which would mean that there is no metering valve.

 

Yes, the drop piece of the combo valve is the proportioning section. This should help:

RBob.

 

Yes, that does help. Thank you.
The proportioning section of 5-16 looks like mine.

But the metering section does not exist. That side does not have any fittings or holes in the end, just the two front brake output ports on the top and bottom. The end is just the cast metal of the housing.

 

So now that I think that the valve is a proportioning valve, how do I disable it?
I have an aftermarket adjustable valve (2 port), that I would like to plum in-line with the factory piece.

Why keep the factory proportioning valve? If the internals can be disabled, it will keep me from having to install a "T" for the front brakes. So basically laziness. If the internals can not be easily disabled, then I may end up pulling it off.

Back to disabling the internals: I would rather pull stuff out than have to shim the spring or something. Is there any combination of components that I can remove to disable the proportioning valve section?

 

According to Baer leave out the spring and seal (see picture).

RBob.

 

That's all there is to it? Sweet!
That diagram is for the newer style, but the plunger looks about the same. I'll give it a try.

My new $15 master Cylinder arrived yesterday. I figure that it probably needs a bench bleed so for $15 I might as well put in a new one. The local parts stores wanted about $90 for a new one ($45 for a rebuilt), but Amazon had one for $15 with free shipping (prime). It came in a box with both the "Bendix" and "Honeywell" names on it. It is made in China. Unfortunately, there were no fittings for bench bleeding. I may still have the plastic hose barbs that came with my last MC.

EDIT: This master cylinder turned out to be the wrong part. Amazon says it will fit, but it is not made for inverted flare connections. It might have been for the later metric cars.

I may go ahead and remove the entire prop valve, just so I can get some good pictures to attach here for documentation.

After that, I will start a new thread about my brake rebuild/upgrades.

Thanks for the help.

 

Now for some pictures.

The pictures here are of the proportioning valve on my 1982 Camaro. This was was originally a disk/drum car. I do not believe that the proportioning valve has ever been off of the car before and I have owned the car since new. So I am fairly confident that it is the original equipment.

You will notice that there is no "metering valve" section, only a proportioning valve. Since I was unable to find any detailed information about this piece, I have included several hi-res images from different angles in order to document what this thing actually looks like. Note the markings cast into the side: "K" and "2." These are the only markings I noticed on the entire piece.

I will be starting a new thread about my brake upgrade process soon, but that doesn't directly relate to this proportioning valve, so I will just link to it here.

 

Here is the new thread I have started where I will detail the current round of brake upgrades:

https://www.thirdgen.org/forums/brak...ml#post5998778