How do I turn in the rear brake piston?

[Chi L. Wong]

Trying to replace the rear brake pads on my A4 and
turning the piston with a needle nose pliers. 
Although the piston turns, it doesn't appear to be
moving in and I've got a long way to go before I can
get the caliper back on.  (I already spend a good
15-30 mins turning it so I don't think it's moving in)

Do I have to apply inward force as I turn it?

Do I have to open the bleeder valve?

Will a brake tool solve all my trouble?





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