Did you install GTA calipers, or are you talking about experience with the Ferrari F360 calipers.
The GTA has a different master cylinder to the basic 156/147/GT (bigger maybe?). I've seen speculation on other threads that the aftermarket kits for the basic 156/147/GT (for example Brembo GT kit) have smaller piston calipers perhaps for this reason even though disc diameter of both set-ups is the same (i.e. 305mm).
Not sure how this work exactly but brakes should automatically compensate for wear - i.e. pad getting thinner over time so more piston travel in relation to pedal travel - so perhaps something similar automatically happens with the bigger calipers!
Last edited by GavinH; 03-07-13 at 10:34.