banjobill80 Posted January 26, 2016 Share Posted January 26, 2016 hello I finally have my 4.0 mounted and firing in my 86 and after altering the cross member ready to climb the next mountain and thinking ahead a little to the brakes. i have read a number of threads talking about using a break booster and master cylinder from a Cherokee to improve the brake system on our beloved MJ's. first question wich year cherokee works best second would i still use the same mj proportion valve/routing block in the front and if i delete the HSV in the rear do i just plug the return line hole on that forward block? also read somewhere about upgraded wheel cylinders but couldn't find out what they were refering to when they said upgraded. thanks for any help and suggestions Link to comment Share on other sites More sharing options...
cruiser54 Posted January 26, 2016 Share Posted January 26, 2016 99 to 2004 Grand Cherokee. Firewall needs a bit of work but nothing bad. Be sure to get the lines which exit the master cylinder. Link to comment Share on other sites More sharing options...
banjobill80 Posted January 26, 2016 Author Share Posted January 26, 2016 99 to 2004 Grand Cherokee. Firewall needs a bit of work but nothing bad. Be sure to get the lines which exit the master cylinder. are they the bubble flare on the master cylinder side and regular flare on the distribution block side? Link to comment Share on other sites More sharing options...
cruiser54 Posted January 26, 2016 Share Posted January 26, 2016 99 to 2004 Grand Cherokee. Firewall needs a bit of work but nothing bad. Be sure to get the lines which exit the master cylinder. are they the bubble flare on the master cylinder side and regular flare on the distribution block side? Metric bubble glare at both ends IIRC. You have to re-flare the end for the prop valve and use sAE fittings. Link to comment Share on other sites More sharing options...
banjobill80 Posted January 26, 2016 Author Share Posted January 26, 2016 99 to 2004 Grand Cherokee. Firewall needs a bit of work but nothing bad. Be sure to get the lines which exit the master cylinder. are they the bubble flare on the master cylinder side and regular flare on the distribution block side? Metric bubble glare at both ends IIRC. You have to re-flare the end for the prop valve and use sAE fittings. ok thank you for the info Link to comment Share on other sites More sharing options...
cruiser54 Posted January 26, 2016 Share Posted January 26, 2016 Firewall mod and rod mod. Photobucket won't let me load the other photos up. Go to my Technical Photos link for more. Link to comment Share on other sites More sharing options...
jeepcoma Posted January 26, 2016 Share Posted January 26, 2016 I did a writeup of my experience, complete with part numbers and pictures. You might find it useful! http://comancheclub.com/topic/30325-complete-brake-overhaul/ Link to comment Share on other sites More sharing options...
Rockfrog Posted January 29, 2016 Share Posted January 29, 2016 Just wanted to jump in and ask about ZJ boosters ... I have a complete booster master prop assembly from a 95 Grand Cherokee (ZJ). Has anyone tried these before? I got it for the prop valve to go with my rear disk conversion. It is a dual diaphragm unit. Just curious on whether it is compatible or not? Link to comment Share on other sites More sharing options...
cruiser54 Posted January 29, 2016 Share Posted January 29, 2016 I'm parting out two 93 XJs. I'll have a look when the boosters come out. Link to comment Share on other sites More sharing options...
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