Brake Proportioning valve

I was quite successfull in "removing" the key parts of the proportioning valve while keeping the casing.

Can you tell me whats involved in doing this? Did you notice any difference in braking?

Thanks in advance.

I just removed the whole proportioning valve and replaced it with a T. I cut the flares off the tubing and used single flare fittings that came with the T.

So . . . is this something worth doing? Is there a real difference in the braking? I have read that it should help (in theory?) but does it?

Thanks for the assistance.

I made more than one change at the same time,
but the result was a significant improvement.
I replaced the booster, master, and replumbed without the brass junction block, and without the stock limiting valve.

(Details at: geocities.com/pantera_tech/MasterBrake_1
)

In a nutshell: I unscrewed the large nut on the end of the body, removed the rubber O ring closest to the large nut, removed the steel spacer, then added a flat steel washer behind the large nut. This basically allows unrestricted passsage of fluid from the inlet to the front wheels. I noticed a fairly substancial stopping power. I think it was worth while.

Today I tried the above modification to the proportioning valve. Now the rubber cap on the end gets blown off because it is leaking fluid around the smaller seal at that end. Any suggestions what went wrong? Did I use a washer that was not the right thickness behind the large end cap? I hate to start messing with the original lines.

I stripped the internals and did the braze the end over modification to mine.

If you are not confident in doing this yourself Larry Stock (PPC Reno) sells OEM proportioning valves modified in this way so you can retain all stock lines and flares.

Julian

I just replaced mine wiht a T fitting. The difference was substantial. Before, it would lock up the rears and spin like mad. Now I can lock up the fronts or all 4 wheels in a panic stop. Only other brake system mod is the ford master. Also, I have a good pedal now under hard stops. Before the T, I had a mushy pedal that would go to the floor and not slow down the car much.