Yes replace all wheel cyclinders, especially if they are aluminum cast ones, as you cannot really hone the cyclinders. As well, you might want to replace the flex hoses, sometimes they get weak which allows the tube to swell, taking fluid and power away from the cyclinders. If they have never been replaced, I might order them as well if I were you.
The other thing to check would be the cams. Although some will say this never happens, it has to me, so.... The snail cams set the distance of the pads to the drum. If one is closer to the drum, it contacts first, and causes the thruck to pull. You said that rebuidling the cyclinder temporarily fixed your problem, but maybe it was that the cams are vibrating one brake tighter, and the other side loose. (definately more noticeable if this is on th front.) If there is not sufficent tension on the snail cams, then replace....
__________________
Andrew Barr.
1972 Series III 109.
"the Tin Turtle"
"However, that was his ploy and I caved....totally caved...   LOL!" Jellijo 
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