How Do Self Adjusters Turn

The self adjusting wheel on the self adjuster what causes it to turn so that it knows where to set itself. There is a plate against the sprocket wheel ,
is it this that sets the distance?
Thanks in advance Denny B
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The plate moves against the sprocket when the pads move. As the pads wear, the plate moves more, engaging the tooth on the sprocket making it turn a little. It won't over adjust by design.
C8oe
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