70 GTO with 2002 z-28 brakes f/r, 1 inch vette, master cylinder...
 

Standard booster.

What proportioning valve (the disk drum is on it) should I run, or should I run a line pressure valve on the rear line, a proportioning valve...

OR WHAT!? Help is needed.

Oh c'mon, somebody else has got to be wondering the same as I. Lil help gents!

I have a similar setup and run a Wilwood adjustable prop valve. I don't think a residual pressure valve is needed with discs, only drums.

Don

x2

I also changed the rear line from 1/4 to 3/16 but I don't know if thats a must for everyones apps

Don,
do you run the wilwood valve instead of the factory prop valve?

Thanks a million for the response.

Yes, just the Wilwood valve, no factory prop valve.

Don,

Thanks for the help, what is the F/R bias on the prop valve, 50/50, 60/40?

It's adjustable:

http://www.amazon.com/Wilwood-Adjust.../dp/B003LT619Q

Don

Thanks Don, I just ordered one.

Hey Jim!
 

Have not heard from you in a while.

They are all correct...of course. Dial in the bias once you get the car going. make sure you do a panic stop to verify the rear will not lock up before the front.