splitting front calipers

["shawn tobin" <suhs2@hotmail.com>]

Now the problem:
My rebuilt caliper of six months age has sprung a leak seemingly at the top 
of the seam where the two caliper halves join.

Questions:
Can I remove and replace the caliper half without taking the caliper off the 
car?
Can I successfully repair this leak at all?
What is involved?
What grade bolts do I use to reassemble?
Locking devices?

Please help!  This is my daily transport.  I need a quick but reliable fix.

Shawn Tobin
'69 midget