snakebite8 Posted September 30, 2019 Share Posted September 30, 2019 I am hoping someone has a spare proportion valve they can sell me. I tried fixing my old one. still wont work. bought two from amazon and they both did not work. the rear brakes wont bleed. only thing stopping me from driving the truck is this. hoping someone has one. thanks truck is 1985 2wd Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 30, 2019 Share Posted September 30, 2019 There were several of those valves, as shown on the page at Documentation/Driveline/Brakes and on the Proportioning Valve tab. The one you want should be the 1984 and later one for the F150. Link to comment Share on other sites More sharing options...
snakebite8 Posted September 30, 2019 Author Share Posted September 30, 2019 There were several of those valves, as shown on the page at Documentation/Driveline/Brakes and on the Proportioning Valve tab. The one you want should be the 1984 and later one for the F150. I can only find universal ones. nothing that is 100% 1985 f150 ones. and the two universal ones did buy did not work and the seller said they would. Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 30, 2019 Share Posted September 30, 2019 I can only find universal ones. nothing that is 100% 1985 f150 ones. and the two universal ones did buy did not work and the seller said they would. What doesn't work about them? I ask because I wonder if your problem is elsewhere. Link to comment Share on other sites More sharing options...
85lebaront2 Posted September 30, 2019 Share Posted September 30, 2019 What doesn't work about them? I ask because I wonder if your problem is elsewhere. Unfortunately, the only one I have is the one from Darth. According to the list it should be E4TZ-2B257-C which is not the one you need, that would be E4TZ-2B257-A Link to comment Share on other sites More sharing options...
snakebite8 Posted September 30, 2019 Author Share Posted September 30, 2019 What doesn't work about them? I ask because I wonder if your problem is elsewhere. rear brakes wont bleed. first new one only passenger rear would. and 2nd new one both rear would not bleed. Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 30, 2019 Share Posted September 30, 2019 rear brakes wont bleed. first new one only passenger rear would. and 2nd new one both rear would not bleed. That's exactly why I asked. The proportioning valve cannot differentiate between the left and right rear brakes. There's one line that comes off the master cylinder and goes to the rear, where it splits at the axle vent on the axle, which you can see in the illustration below. So if you were able to bleed one rear brake and not the other it isn't the proportioning valve's fault. I'm going to guess that you may have a flattened brake line somewhere. Maybe along the frame or on the rear axle. Or, that the rubber hose that connects from the frame to the rear axle is bad. I've heard about them causing similar problems. Link to comment Share on other sites More sharing options...
Steve83 Posted September 30, 2019 Share Posted September 30, 2019 The proportioning valve cannot differentiate between the left and right rear brakes.I agree.There's one line that comes off the master cylinder and goes to the rear, where it splits at the axle vent on the axle, which you can see in the illustration below. So if you were able to bleed one rear brake and not the other it isn't the proportioning valve's fault. I'm going to guess that you may have a flattened brake line somewhere. Maybe along the frame or on the rear axle. Or, that the rubber hose that connects from the frame to the rear axle is bad.For the same reasons that the prop.valve can't cause a L/R bias, neither can the frame tube or rear axle hose. The fault MUST be between the splitter block on the axle vent, and the problem wheel cylinder. But if anyone actually needs one, I still have this one that worked fine when I switched to the later system: https://supermotors.net/getfile/932180/thumbnail/propvlv83.jpg Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 30, 2019 Share Posted September 30, 2019 The proportioning valve cannot differentiate between the left and right rear brakes.I agree.There's one line that comes off the master cylinder and goes to the rear, where it splits at the axle vent on the axle, which you can see in the illustration below. So if you were able to bleed one rear brake and not the other it isn't the proportioning valve's fault. I'm going to guess that you may have a flattened brake line somewhere. Maybe along the frame or on the rear axle. Or, that the rubber hose that connects from the frame to the rear axle is bad.For the same reasons that the prop.valve can't cause a L/R bias, neither can the frame tube or rear axle hose. The fault MUST be between the splitter block on the axle vent, and the problem wheel cylinder. But if anyone actually needs one, I still have this one that worked fine when I switched to the later system: https://supermotors.net/getfile/932180/thumbnail/propvlv83.jpg Steve - I fully agree that the frame line nor the hose can cause a problem with one brake and not the other. But, I wondered if there was something odd going on that might have gotten overlooked since usually he seems to be unable to bleed either rear brake. Perhaps the time he could bleed the passenger's side was a fluke? Link to comment Share on other sites More sharing options...
snakebite8 Posted September 30, 2019 Author Share Posted September 30, 2019 Steve - I fully agree that the frame line nor the hose can cause a problem with one brake and not the other. But, I wondered if there was something odd going on that might have gotten overlooked since usually he seems to be unable to bleed either rear brake. Perhaps the time he could bleed the passenger's side was a fluke? also no brake fluid is leaving the valve to go to the rear Link to comment Share on other sites More sharing options...
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