->  JB> You should be able to get a kit from the dealer or a brake
->  JB> specialist containing only the rubber bits for your brakes.

-> I would have thought so too,  but these days the pricing it such that it's
-> easier/cheaper to just replace the whole caliper,  master cylinder,  or
-> whatever.  Same thing with wheel cylinders...

 When compairing the Price of a Rebuilt assemble and having yuor
assemble rebuilt that is true. BUT if one can do the Rebuild yuor self
the price of the Rebuild Kit(IF avaialble) is the Winner every time. 
I have never done a Disk Caliper myself but the old Wheel Cylinders and
Master Cylinders were almost a "No Brainer".
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