Brake proportioning value

[xrunner123]

I just got done upgrading my rear cylinders to the S10 type and took the car for a ride. Well now just feathering the brakes will lock them up, so I guess I will need an adjustable brake proportioning valve.

My question is what kind should I get? I looked at these from Summit. Is there a real difference? And does anyone have others that I should look at?

Wilwood
Summit
Mopar Performance

Thanks

 

[xrunner123]

According to Summit I can't use any of these. Can someone help me on what to get to so I can adjust the pressure front to rear?

Thanks,

 

[xrunner123]

Can anyone help a brother out?

 

[GNVAIR]

You should definitely be able to use those adjustable proportioning valves. You would have to install it in the rear brake line. They do not come with the adapter fittings for the lines, but you should be able to pick them up locally. Another from what I heard is to use the b body 12" brakes on the front. That should balance it out nicely.

 

[xrunner123]

Originally posted by GNVAIR
You should definitely be able to use those adjustable proportioning valves. You would have to install it in the rear brake line. They do not come with the adapter fittings for the lines, but you should be able to pick them up locally. Another from what I heard is to use the b body 12" brakes on the front. That should balance it out nicely.

That's what I figured. Don't know why they would say that.
Thanks

 

[Buick Beginner]

If I may jump in

I would like to get a PV for maybe a little different reasons, I'd like to get my rear brakes to clamp harder. I've already got the Kirban soft shoes, but still I'm holding only1 to 2 lbs of boost on the line. I didn't go with the S-10 wheels cylinders but I did have the drums turned. But yet at 2 lbs of boost the rear tires start coming loose. Will any PV work for this problem? - BB

 

[xrunner123]

I got the proportioning valve and will install it soon. Now I assume that I will just tap into the line going to the rear brakes coming out from the proportioning valve that it there now.

So by restricting or lowering the pressure to the rear I will be increasing the pressure to the fronts. Correct?

Also, is it risky doing this job myself? And does anyone have any tips or is it just straight forward?

Thanks

 

[tom h]

Originally posted by xrunner123
...So by restricting or lowering the pressure to the rear I will be increasing the pressure to the fronts. Correct?

Also, is it risky doing this job myself? And does anyone have any tips or is it just straight forward?

Strictly speaking, a manual proprtioning valve (like the Wilwood) onbly reduces the rear brakeline pressure, it does not increase the front.

per Wilwood's specs, the valve will control the rear pressure from 0% reduction (ie, no effect) to about 50% reduction.

Installing it is straightforward if you have experience with brake work in general, including tube fabrication skills.

I'm starting to plan out a simultaneous install of S10 rear cylinders, a Hurst line-lock, and a Wilwood prop valve. The biggest hassle I foresee is installing both the line-lock & Wilwood valve down by the stock combination valve, in the tight spaces, without the new components being susceptible to road hazards, (occasional flying rock).