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Old 06-18-2011, 09:16 AM   #1 (permalink)
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79 proportioning valve question

I have a 79 f150 and the brakes were not really working as well as I would like so I decided to bleed them. I have a phoenix systems vacuum gun which I really like btw. Anyway the back two wheels bleed like normal until I saw the fresh fluid coming through then I closed them. There were some little chunks of corrosion that came through too. When I got to the front brakes there was no pressure at all and even at the T on the front axle there was no fluid so I unhooked where the line comes out of the proportioning valve, to the front end and still no pressure.

So I took the prop. valve out this morning and cleaned it and blew it out with the air gun. Air flows both ways between the line going to the rear and the rearward input on the prop. valve but only flows from the line going to the front back through the forward most inlet and not the other way at all. I cleaned it with brake cleaner and tried to blow air through it for a while with no luck.



Does this mean that the proportioning valve is bad and I need a new one? And will one off of an f350 of the same body style work with it? (My buddy's parts truck)
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1979 F150 shortbed on 36'' TSLs, 429 big block
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Old 06-19-2011, 08:32 AM   #2 (permalink)
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this is a common unknown issue,if you look at your proportioning valve the nipple on the front is a type of check valve,pull it out,figure out a way to hold it out and bleed the front brakes,it talks about this in a good manual but not all of them list it,I have seen this type of proportioning valve on many rigs and few people know that to properly bleed the brakes you have to pull that nipple out and fabricate something to hold it out while you bleed,then let it back in and you are done.
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Old 06-19-2011, 11:04 AM   #3 (permalink)
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Think there is a tool for that. Saw it over on ford-trucks.com. Wasn't expensive. I tried to use vise grips but it never would hold for me.

I ended up using some tool my Dad had in his shop.
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Old 06-19-2011, 12:01 PM   #4 (permalink)
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Vise Grips with a wire tied to them and pulled back and tied to something else like the front cross member or rad. support. I've blead a many this way.
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Old 06-19-2011, 12:04 PM   #5 (permalink)
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hmmm, well I tapped the pin sticking out the end of it in a little bit and now air flows both ways through all ports. I tried to mount it up this morning and tried to get the front output to thread in for over an hour with no luck. Im sure i'll be able able to get it next try and hopefully after I bleed it all out it should work. I hope
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