Eagle_SX4 Posted September 18, 2023 Share Posted September 18, 2023 I have been trying to figure out the right length for the rod that connects the valve to the axle. Does anybody know what actually happens with the valve when the bed is empty vs loaded. My thoughts was that when loaded it would increase the brake s on the back and decrease them with it empty. That doesn't seem to be the case with my truck it seems to act the opposite way. The longer the rod (simulating a heavy load) makes my brakes work less in the back and a shorter rod (simulating an empty bed) makes the brakes work harder and lock up before the fronts. Any info on how it is supposed to function would be great. Link to comment Share on other sites More sharing options...
fiatslug87 Posted September 18, 2023 Share Posted September 18, 2023 Have you read this yet? May answer your question. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted September 18, 2023 Author Share Posted September 18, 2023 Yes that is the thread I used to make a new rod. I am just interested in how an empty bed affects the brakes vs a fully loaded bed. Is there more braking pressure with the bed empty or full? Link to comment Share on other sites More sharing options...
Ωhm Posted September 18, 2023 Share Posted September 18, 2023 More FYI stuff. @coheed Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted September 18, 2023 Author Share Posted September 18, 2023 Okay it looks like the arm is attached to a cam that pushes a spring to vary the amount of fluid allowed to the wheel cylinders. What is the relation between the cam and the arm? How are they timed together? I think I read somewhere in the FSM about a tool to check the position of the arm does any one know anything about that? Link to comment Share on other sites More sharing options...
Ωhm Posted September 18, 2023 Share Posted September 18, 2023 brake system_Brake height sensing valve.pdf Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted September 18, 2023 Author Share Posted September 18, 2023 Thanks Ωhm . It looks like someone may have removed the arm on my valve at one point because there is no spring on mine. I am going to look at it closer when I get a chance tonight. Link to comment Share on other sites More sharing options...
coheed Posted September 18, 2023 Share Posted September 18, 2023 24 minutes ago, Eagle_SX4 said: Thanks Ωhm . It looks like someone may have removed the arm on my valve at one point because there is no spring on mine. I am going to look at it closer when I get a chance tonight. I will say on both of my 86s, neither valve had a spring on it. Honestly IDK if I've ever seen one with a spring on it. Also the arm is ruined to the cam as it slots onto an eccentric plastic bushing on the outside of the valve. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted September 18, 2023 Author Share Posted September 18, 2023 It looks like the plastic bushing can be pressed on to the valve at any position which is why the alignment tool is needed. So if you had an alignment tool and new bushing the rod length wouldn't matter as long as you install the rod to the axle at ride height and use the arm as alignment point for the bushing. I am going to order an alignment tool and see if mine is adjusted properly. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted September 22, 2023 Author Share Posted September 22, 2023 I got the alignment tool in the mail and am working on a write up show how to align the arm properly without the tool. Just wondering how to link other threads in to my post with out using the url? Link to comment Share on other sites More sharing options...
gogmorgo Posted September 22, 2023 Share Posted September 22, 2023 4 hours ago, Eagle_SX4 said: I got the alignment tool in the mail and am working on a write up show how to align the arm properly without the tool. Just wondering how to link other threads in to my post with out using the url? Just copy and paste the URL into the editor and it'll automatically insert the preview banner and everything like this one: Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted September 22, 2023 Author Share Posted September 22, 2023 Thanks got the how to written up and edited the links. Here it is. Link to comment Share on other sites More sharing options...
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