How does brake Proportioning Valve work?

[palle7688]

How does this thing work?
I do know it for brake balance, but how?????
What's inside???

Pic from Tiltonracing.com
Is it just a ajustable orifice?
or is it like a relief valve?
or does it lock out excessive pressure?

How does the '84-'88 Carrera 33(55) bar valve work?

[}{arlequin]

The latest issue of Grassroots Motorsport (240Z and 350Z on the cover) has an in-depth article on the whole brake prportioning idea. It's in depth and almost too informative.

edit: sorry, didn't realize you were in EU, maybe you don't have access to the magazine. Hopefully someone can scan it and post it.

[palle7688]

Thanks dave, but you are right, I'm over the pond.
It would be nice if somebody could do that, please!!!!!!!!
It's challenges my technical curiousity.

[Bill Verburg]

Here's what the inside looks like, as pressure builds it works against the spring cutting offf flow to the corresponding set of calipers.

[palle7688]

Bill, nice pic.
Anybody have an engineers drawing or schematics of whats inside.