bigbadxj

Do you really need that stupid Proportioning valve? I know they were put there because of different braking characteristics between disc and drum brakes. But, If it is messed up couldn't you us a hydraulic T valve for the front and just run the back straight from the Master cylinder? I mean what would it hurt to do this? I just went through a massive brake issue with a family member's car and Ihave been thinking about it, I have no plans of doing this just wondering.

radio flyer

The valve acts as a failsafe(by design anyway) If you have a line break anywhere in the system it is supposed to prevent total loss of brakes by isolating the front from the rear!! That being said i have had a line break on mine and can say in no uncertain terms B.S.-at least on my jeep

crashzx6r

x2 i dont think i have one or it doesnt work because when i broke my rear line i had no brakes, well i did but on the floor standing on them i didnt have enough to keep it from rolling at 1200rpm

bigbadxj

So far the only reason that I have found was that the also stop the rear wheels from locking up during emergency braking before the invention of ABS. But I don't think they help with that either? If I had a junk car I would try it just to see what it would do with out it.
Was your jeep lifted with big tires at the time? that may have been why it did not do it all the way? I don't know?