Ford: 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

>The self adjusting wheel on the self adjuster 

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