Did you bench bleed the master cylinder? If not that can cause it.

Here's a Wikihow on it.

https://www.wikihow.com/Bleed-a-Master-Cylinder

Chad

 

Incidentally, that article mentions how a mechanic would use a vacuum bleeder. Those or a pressure pot can sure help.

I like my pressure pot but they are not cheap. You might be able to rent one or the other, too.



Chad

 

What differential/proportioning valve did you use? The stock Ford ones have a bleeder valve on them that must be pulled out or pushed in, in order to get fluid to flow to the front brakes. You will still get fluid but you may never get all the air out unless that metering valve is held open.

 

Check all fitting connections for any fluid leaks.

 

 

Here is a page from the chassis manual, "sort of", it's hard to scan as this thing it is about as thick as a New York phone book. Forget that bleeder tool, they ain't none to be had. You will have to make your own or get someone to lay under there and hold that pin out or push it in depending on which system you used.

 

Check out the rod length on the power booster. It might not be long enough to go all the way into the master cylinder. Especially if your power booster is aftermarket. That was my issue after doing disc/drum total replacement from drum/drum. I did all new to include lines, calipers rotors, etc.