HELP--caliper leaking!!

[Joe Elliott <jee@domain.elided>]

So the rear discs came off of the GTV6 incredibly easily.  But when I 
backed the pad off on the outboard side of the right caliper, a drop of 
brake fluid oozed out.  After I got the pads out and the disc off I 
adjusted that piston back in, thinking that perhaps I had backed it off too 
far.  But now it's just dripping consistently!  What's the deal here?? 
These calipers are 3 years old and have 25,000mi on them.  I knew they were 
failure prone but I at least expected the one on the left (exhaust) side of 
the car to fail first!  Could I have backed that piston off too far?  Could 
I have over extended the piston when I accidently tried to set the 
handbrake after having backed the pads off?  Can I still drive the car? 
Are there rebuild kits available, or do I have to spend $110 or whatever it 
is on another new caliper???

Thanks...
Joe Elliott
'82 GTV6
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