buddy208 Posted August 9, 2009 Share Posted August 9, 2009 why is there two brake lines going to the back axle. Link to comment Share on other sites More sharing options...
Automan2164 Posted August 9, 2009 Share Posted August 9, 2009 Supply for the height sensing valve. A simple search on height sensing valve should show you all you need to know. Its been talked about A TON... Rob L. Link to comment Share on other sites More sharing options...
Eagle Posted August 9, 2009 Share Posted August 9, 2009 why is there two brake lines going to the back axle. One line provides proportioned rear braking under normal conditions. The second line is a bypass, so if the front brakes fail the rear brakes get full pressure with no proportioning. It's a common misconception that the second line is a "return" line. I don't know where that came from, but it's what I was told and I believed that for several years ... right up until I actually investigated how the front metering block and rear height-sensing valve work. Link to comment Share on other sites More sharing options...
buddy208 Posted August 10, 2009 Author Share Posted August 10, 2009 can you just block one of them off Link to comment Share on other sites More sharing options...
Eagle Posted August 10, 2009 Share Posted August 10, 2009 Yes, you can block one of them off. There are probably half a dozen threads on this site discussing which one to block off and how to do it. Link to comment Share on other sites More sharing options...
jpdocdave Posted August 10, 2009 Share Posted August 10, 2009 po on my mj had the brake lines done, and when they ran the line to the back they probably realized they can't get the proportioning valve anymore, its kinda funny a new line was made and ran all the way back for nothing. i can just picture the poor tech when he got to that point :headpop: anywho, i am rambling. so they simply ran a straight line back without using the valve. it works ok, it seems it acts as though there's a full load all the time. the rears are grabby right at first, i got used to it quickly, and with a full load the brakes are very smooth. remember by design rear brakes engage a split second before the fronts, so without the valve, it gets full pressure, so you just have to ease on the brake for the first few miliseconds of the pedal travel. :thumbsup: Link to comment Share on other sites More sharing options...
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