Brakes pulling to the right?

[wobblefoot]

I replaced the master cylinder because it was leaking.Brakes were fine for 5 or 6 months.
Just the other day my truck started pulling to the right,when applying the brakes.
Thinking the front brake lines were collapsing, because they were severely cracked and just old I replaced them,I properly bled the brake lines,checked the front wheel cylinders,shoes,etc.Everything was fine.Again I bled them to make sure I did it right.
Drove the truck not even a mile and it started to pull to the right again.Re bled the lines and it still pulls to the right.
Then I jacked the truck up in the front and Im wondering if the kingpin should have movement.
The left side when I grab the tire on top and bottom, like I was checking tie rods the I beam tries to move.
But when I do the right side (pass) side I notice there's a tiny bit of movement in the kingpin (just enough that I would think it might be the problem)Because it doesn't try to move the I beam like the other side.
Just wondering if anybody could help me just not sure,If its kingpins I'm going to do the disc conversion but I didn't want too at this time because of Xmas.
I was also thinking would the proportioning valve have anything to do with it?

[cep62]

Are the drums adjusted equally ?
Try cranking the star wheel until you can hear them start to drag when spinning them by hand.

[FORDification]

http://www.fordification.com/tsb/viewto ... p=690#p690

[70_F100]

Keith, one thing is not mentioned there, and should have been.

Drums can develop "hot spots" that are basically a flaw in the casting.

When turning drums, they can be seen as a spot that the lathe doesn't cut.

Years ago, the AMMCO lathes had an attachment with a grinding wheel for surfacing the metal in these hot spots.

Basically, it's cast material that has hardened more than the area around it so that it cannot be cut with a standard lathe.

These areas will also cause brakes to pull, as they develop over time, and will not demonstrate the same wear properties as the cast material around them.

I know that you got this information from a Ford TSB, but it's something the Ford engineers overlooked during their research and diagnostic information.