pingpong Posted January 4, 2006 Share Posted January 4, 2006 Has anyone found or done a write up on swapping in a Xj front proportioning valve? If so can I have a link or two. Thanks Patrick Link to comment Share on other sites More sharing options...
mjeff87 Posted January 4, 2006 Share Posted January 4, 2006 Not much to it, they're basically the same valve except the XJ one doesn't have the extra rear "safety" line circuit in it. You just have to cap off/pull out that line on your MJ. The rears then get fed by the bottom front circuit on the prop valve (vs. the out-the-front one on the MJ valve, which isn't there on the XJ one) Jeff Link to comment Share on other sites More sharing options...
Bounty Hunter Posted January 4, 2006 Share Posted January 4, 2006 Very straight-forward swap, I pulled the extra line to the rear. Removed the mastercylinder to access the prop. valve easier. Link to comment Share on other sites More sharing options...
Eagle Posted January 5, 2006 Share Posted January 5, 2006 As above. The rear line you want to remove is the one going to the rear, load-sensing proportioning valve. You should by-pass that entirely if you change to the XJ combination valve, otherwise you'll be running two proportioning valves in series, and my head hurts just thinking about that. Link to comment Share on other sites More sharing options...
pingpong Posted January 5, 2006 Author Share Posted January 5, 2006 Thanks for the replies guys. Since we cut the frame off behind the cab, I figured I might as well fix my braking issues. Patrick Link to comment Share on other sites More sharing options...
pingpong Posted January 8, 2006 Author Share Posted January 8, 2006 Well when I went to do this mod, I got to looking at the used proportioning valve I had (90 xj), and realized that the return line from the hieght proportioning valve is Just plugged off on the xj one :shock: Needless to say I only realized this after I broke one of my hard line going to the rear :cry: so I am going to have to replace it anyways, But i figured I would pass this ont o you guys. Patrick Link to comment Share on other sites More sharing options...
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