Self adjusting means that the gain of play during wear out will be adjusted automatically, that's how an hydraulic clutch works. Wearing out, the fork lever position moves a little toward cabin, so the slave cylinder will rest on that position, removing the play. But the total excursion will remain the same, so moving the cylinder toward the fork let use all it's excursion to depress the fork. It's like having a little more pedal excursion.
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