blueflame:
Maybe, as Grant said, the master cylinder...and maybe the brake lines...?
Your dealer should be able to see the part numbers for the Master Cylinder on each car equipped with PCCB and see if there is a difference. If you upgrade to GT3 version (if different), this is not a very expensive upgrade (987 owners did this frequently).
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18 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi