AMC86Kid Posted December 8, 2016 Share Posted December 8, 2016 ok guys take a look at this pic and hopefully you can tell me what it is its under the bed on the driver side rear i was wondering what does it do and if i need it or can i remove it it has like a swinging bar that swings from left to right Link to comment Share on other sites More sharing options...
Big Dan Posted December 8, 2016 Share Posted December 8, 2016 Its the brake proportioning valve, its disconnected. Link to comment Share on other sites More sharing options...
Eagle Posted December 8, 2016 Share Posted December 8, 2016 That's the load sensing (or height sensing) proportioning valve for the rear brakes. The purpose is to reduce pressure to the rear brakes when the truck isn't loaded, so the rear brakes don't lock up too soon and cause you to spin out. As the bed is loaded, the bed drops relative to the axle, causing the arm to move and increase the amount of pressure to the rear brakes. However, that swinging arm is supposed to be horizontal, and there should be a connector link to a ball stud on the differential housing. Yours appears to have been disconnected by some previous owner. There are photos in other threads here that show how it's supposed to look. Do some poking around in this discussion area and the D.I.Y. area, or maybe someone who remembers where to find the photos will jump in with a link. Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 8, 2016 Author Share Posted December 8, 2016 when you say horizontal do you mean its suppose to swing from front bumper to rear bumper ? ok i will look around to see what its suppose to look like hopefully some one will post a pic of how it should look so basically you recommend that i keep in on there and don't remove it Link to comment Share on other sites More sharing options...
Eagle Posted December 8, 2016 Share Posted December 8, 2016 No, it's swinging across the vehicle centerline, correct? You wrote that it swings left to right. The basic position for it should be swung to the right (passenger side) and up, so the arm is parallel to the ground. Link to comment Share on other sites More sharing options...
Eagle Posted December 8, 2016 Share Posted December 8, 2016 Here ya go: This doesn't show the axle end, but this is what the arm should look like when connected. Even better: http://comancheclub.com/topic/45839-mj-height-sensing-brake-proportioning-valve-adjustment-procedure/ Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 8, 2016 Author Share Posted December 8, 2016 oh ok so it swings from the top of the driver side rear tire down to the rear axle ok i get it but where does the other end of that metal rope connect to ? Link to comment Share on other sites More sharing options...
Eagle Posted December 8, 2016 Share Posted December 8, 2016 oh ok so it swings from the top of the driver side rear tire down to the rear axle ok i get it but where does the other end of that metal rope connect to ? Did you click the link I provided? That tire in the photo is not the driver's side tire, it's the spare. Link to comment Share on other sites More sharing options...
DirtyComanche Posted December 8, 2016 Share Posted December 8, 2016 It's a rod. It goes to the diff cover area. There's a stud for it there. 95% of ones I encounter have been disabled either intentionally or not. Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 8, 2016 Author Share Posted December 8, 2016 ok i clicked on the link and i see what your saying it regulates the brakes so they will be stronger in the back if a heavy load is applied to the bed so if i remove it then when my bed is carrying a heavy load i will not get as much breaking power as with it on Link to comment Share on other sites More sharing options...
Eagle Posted December 8, 2016 Share Posted December 8, 2016 so if i remove it then when my bed is carrying a heavy load i will not get as much breaking power as with it on No. Go to the D.I.Y. area of the forum and you'll find an article on how to remove it. It's not as simple as it seems, because it involves the total removal of one of the two brake lines from the front to the rear -- and many people remove the wrong one before they figure out the mistake. If you remove it, you will always have FULL brake power to the rear wheels. That might sound like a good thing, but the back of a pickup is pretty light when there's no load, so on snow or ice, or in a panic stop, or even in the rain, the rear wheels will lock up before the fronts. That causes spin-outs. That's why the factory put that thing in there. You would be better advised to fix up a rod and connect it so it functions properly. Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 8, 2016 Author Share Posted December 8, 2016 oh ok so i will try to hook it up and take a pic then maybe you guys can tell me if it looks like i hooked it up correctly Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 8, 2016 Share Posted December 8, 2016 http://comancheclub.com/topic/16955-adjustable-mj-load-sensing-valve/ Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 8, 2016 Author Share Posted December 8, 2016 awww i see ok i will try to make a bar and connect that swinging piece of metal to the clip bracket on the axle thanks Link to comment Share on other sites More sharing options...
dasbulliwagen Posted December 8, 2016 Share Posted December 8, 2016 Another thing you can do if you can't get the rod or the bracket is gone from the diff is use a piece of wire or a zip tie to hang the swinging arm in the 2-3 oclock position from above. This will give you some use of your rear brakes back without going through the trouble of finding the parts you need to fix it properly. Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 8, 2016 Author Share Posted December 8, 2016 ok thanks Link to comment Share on other sites More sharing options...
desbennett004 Posted December 9, 2016 Share Posted December 9, 2016 http://comancheclub.com/topic/16955-adjustable-mj-load-sensing-valve/ On a side note, is that the factory rear sway bar in that picture? My MJ didn't come with one, I guess it was removed by the PO? Sent from my SM-N900W8 using Tapatalk Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 9, 2016 Author Share Posted December 9, 2016 idk but it sure don't look factory with it being all shinny and black Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 9, 2016 Share Posted December 9, 2016 MJs never had a factory sway bar. I did it myself HERE and it's a very worthwhile mod for a street rig. Shortbed model HERE Unfortunately the guy that posted this pulled his pics. Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 9, 2016 Author Share Posted December 9, 2016 does the sway bar make your back axle stronger ? Link to comment Share on other sites More sharing options...
Dzimm Posted December 9, 2016 Share Posted December 9, 2016 No it helps minimize body roll when turning or driving across a slope. It also limits the flex of vehicles so most offroad rigs don't have them. Does nothing as far as strength to the axle. Side note, Google is your friend as is the search box here. Link to comment Share on other sites More sharing options...
Eagle Posted December 9, 2016 Share Posted December 9, 2016 idk but it sure don't look factory with it being all shinny and black Everything about Hornbrod's MJ is either shiny or black. He's like that -- a thoroughly despicable person. :thumbsup: Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 9, 2016 Author Share Posted December 9, 2016 good to know thanks Link to comment Share on other sites More sharing options...
RustyRodder Posted December 9, 2016 Share Posted December 9, 2016 Well this was a nice topic- after reading, I went to look if mine was still hooked up! Link to comment Share on other sites More sharing options...
AMC86Kid Posted December 9, 2016 Author Share Posted December 9, 2016 well is it still hooked up ? Link to comment Share on other sites More sharing options...
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