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Thanks I think i get it now !
All 4 pots calipers either on a s14 or a s15 are to be used with 280mm diameter and 30 mm thickness rotors.
The 4 pot z32 calipers are different as far as the piston outside circles go (they are not as defined as the iron s14 and s15 are and they have the sumitomo engraving in the front)-And the early z32 calipers accept 26mm thickness rotors but later models use the thicker 30 mm ones.
That was the reason i was totally buffled what caliper to use with what rotor and how to choose as they all look so similar to someone that does not know those little differences.
As i said in the other post i wanted a cheaper altenative to the oem r33 gtr brembo's and to the initially cool but still too expensive Evo brembo install.
I can find the iron s14 4 pot calipers really cheap and the same goes for a brand new set of 280mm diameter and 30 mm thickness rotors.The z32 ones go for almost twice as much because they are aluminium so s14 /s15 iron ones are the best cost effective upgrade...
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