bentnotbusted Posted November 18, 2009 Share Posted November 18, 2009 So I'm having a bit of an issue with the rear brakes on the MJ. Just changed one of the hard lines going into the load valve because of a small leak at the fitting. I was under the impression that this was the cause of my pedal going soft. Apparently not :shake: I spent the better part of an afternoon (and a full quart of brake fluid) trying to get a decent pedal but it's just not happening. Brakes will pump up after 4 or 5 pumps everytime but let off and hit them again and you're right back where you started. I've bled them at the wheels, at the top of the load valve, and at the master. I've replaced almost every brake line on this truck now at some point and I've never had a problem like this. Anyone got any suggestions? Know anywhere in the MJ brake system that tends to trap air? Could it be a problem with the load valve? We're actually leaning toward the master cylinder but I'm just curious what the experts think. I might get aggravated enough tonight to throw a master on it anyway though. Link to comment Share on other sites More sharing options...
Eagle Posted November 18, 2009 Share Posted November 18, 2009 Did you follow the factory procedure to bleed the system? Link to comment Share on other sites More sharing options...
comanche09 Posted November 18, 2009 Share Posted November 18, 2009 http://comancheclub.com/forums/viewtopic.php?t=4917 Hope that helps! Link to comment Share on other sites More sharing options...
bentnotbusted Posted November 18, 2009 Author Share Posted November 18, 2009 Thanks a ton guys, I never knew there was a special procedure. I'll give that a try and see what happens. Odd I've never had this problem before though, especially considering this is the second time I've replaced this particular line. Link to comment Share on other sites More sharing options...
maddzz1 Posted November 19, 2009 Share Posted November 19, 2009 If bleeding doesnt work and If your going to replace the master, you should do the double booster upgrade with a 95-96 XJ master and booster. Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 19, 2009 Share Posted November 19, 2009 :agree: As far as the "special procedure" in the FSM, I don't use it and have never had a problem. After a good long gravity bleed, I always bleed from the farthest point away from the master and working inward, i.e. RR, LR, RF, LF. Never have done anything special for the load sensing valve. I also think your master cylinder might be leaking internally. Link to comment Share on other sites More sharing options...
bentnotbusted Posted November 26, 2009 Author Share Posted November 26, 2009 Finally got around to this today. Big thanks to you guys for the info. I have brakes again! :clapping: Link to comment Share on other sites More sharing options...
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