[s-cars] Replacing rear brake pads - how do I compress the piston?

[Thomas Rodriguez]

I decided to replace my rear brake pads today following the procedure
in the Bentley manual.  I got the old pads out and put the new pads in
with very little fuss.  To enabel the caliper to fit over the new
pads, which are of course thicker, I need to push the piston into the
caliper a bit. I can't seem to do this.  The Bentley manual says
"Press the piston in by turning clockwise and pushing forcefully."  I
gave the piston a half turn and pushed on first with my fingers and
then with a very sturdy c-clamp, but it simply won't budge.  Another
half turn and futher compression wth the c-clamp got me nowhere.  I
must be doing something wrong.  Am I supposed to turn the piston
clockwise multiple times, effectively screwing it farther into the
caliper?  I would appreciate if someone would reply with a simple but
appropriately detailed explanation of how to push the piston into the
caliper.

Thanks,
Tom Rodriguez
'95 S6