I've been working on self-adjusting brakes since they came out in the early 60's, and there are a few little details to consider. First, manually adjust the shoes close to the drums after shoe replacement, but not dragging heavily. If you leave the adjusters fully retracted, it will take dozens of stops before you have a full pedal. Come to a full stop in reverse each time you apply the brakes during final adjustment. It's not necessary to pull forward to reset the adjusting pawl, but it's not uncommon to need 20 or more full stops to get it right. It is absolutely essential to keep the starwheel adjuster clean and lubed, or it will lock up and refuse to self-adjust, so dismantle and clean it thoroughly, then lube the threads with waterproof lithium grease such as Lubriplate at every shoe replacement.
Jerry

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