[s-cars] Rear caliper piston: how to move it into the caliper

[Konstantine Bogach]

  Hi,

I am changing rear rotor/pads and need to get the piston into the 
caliper.  Do I need to screw it onto  or just press it in?  I remember 
there is a threaded shaft inside to push the piston by parking brake 
mechanism.  It makes me doubt.
I rebuilt 4 of them in the past but time did not spare memories.

Thanks.
Konstantine