Putting Ford Exploder rear disc brakes on my dana 60 on my 1990 YJ. Will I have to change the prop. valve or master cylinder or can I get an adjustable proportioning valve from Wilwood and that will do the trick?

The front is a dana 44 with F-150 disc brakes with single piston calipers.

Seems to be the question of the day so far......

This works for XJ's may work for your YJ.
Modified Proportioning Valve for Rear Disc Brakes (http://www.bigoffroad.com/pages/bigpages/bigtech/proportioning_valve.htm)

Thanks for the article. (I posted that pretty hastily- didn't have time to check all around.)

I did a search after I had some more time and it seems that everyone pretty much just pull off the o-ring and brake!

I am having that problem in my CJ with a 60 and explorer style discs, I have upgraded my MC and Vaccum booster and i have throughly blead the brakes. I have new stainless lines and i have very little brake feel. the only thing left to check is the prop valve. does anyone know if i can do this trick on my CJ, or should i get a new prop valve, any idea what i should get?

You can either ditch the existing proportioning valve and run a Tee for the front and a willwood adjustable valve for the rear, or a ZJ combination valve is already set up for rear disc and works well.

Ben