Question about 1995 Ford F350

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Fading brake pedal

I have a 1995 ford f-350 diesel 2 wheel drive dually , and when i push on the brake pedal the pedal will slowly go to the floor I have replaced the master cylinder, pads and rear shoes including all the hardware front and rear, Ihave checked the vaccume at the booster and have plenty, I also replaced the check valve that goes into the booster, collectivly I have ran 2-3 gallons of brake fluid the system and no air in the system, afterall that Istill have the same problem that I started with. I pull a trailer alot between april and october and as of now I can barely stop the truck letalone the trailer and truck. any help would be appreciated

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  • aarnold3car Jan 17, 2009

    pedal is stiff when the brakes are first applied then pedal will start going to the floor. no fluid leaks and the pads adjusted up

  • aarnold3car Jan 18, 2009

    the truck has a proportioning valve that threads in the rear port of the master cylinder and a rear anti lock brake valve on the frame 1 foot under the master cylinder. There is also a rear ABS sensor (R.A.B.S.) in the center and on top of the rear end housing

  • work4it1 May 11, 2010

    ok well does it have abs at all or a load/height proportioning valve on the frame rail any where ?

  • work4it1 May 11, 2010

    Make sure that the rear shoes are adjusted up. I take it that there are no leaks ? the next step is to take a vise grip and pinch off the rear brake hose at the diff see is this makes the pedal hard if not try it on the front one wheel at a time .



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Perfect well at this point i would say that tha abs valve is bypassing fluid. If you can un hook the line that comes into the abs valve and plug it and try and bleed the system where you cap the line going into the abs valve. If you get a good pedal after pluging the line going into the abs valve this tells me that the abs valve is bypassing fluid give it a try i have ran into this a few time and the abs valve has been bad. Also can you rate this sluton also i do hits on my own free time thanks good luck

Posted on Jan 18, 2009

  • Custom tbird May 28, 2012

    I've gone threw several master cylinders and the pedal still goes to the floor even after all new pads shoes rotars and drums but the master cylinder doesn't lose break fluid plz help i can't figure this out


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Sounds like a bad master

Posted on Jan 17, 2009

  • lowlife1972 Jan 19, 2009

    it also could be the master leaking off inside i had the same issue on a 98 suburban



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