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Looks like a rebuild kit is just not offered for the 911...not surprised..not many rebuild M/Cs anymore.
I would take the suspect M/C off and take it apart...depth of the piston compared with the old M/C prior to taking them apart..look at the bore and see if it is machined smooth..the pistons..are they clean with no machining debris? Seals intact? Not folded or poorly sized to the bore? Springs in there too?
Disassemble the old M/C and you took off and see if it is an application problem..compare...bores the same size? Springs? Seals?
The fault should be obvious..back when I did Porsche work..we did rebuild M/Cs with no issues..now with our litigious society..no way would I do that on a customers car (I would experiment on my own 911 and see what is going on with the czech M/C though) .....make a warranty claim with your M/C supplier once you know what is wrong with the czech M/C.
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