NISSAN GTR braek information

R32 GTSTMaster Cylinder diam (mm) - 25.4 area 506.71mm^2
Front Caliper Piston(diam x qty) - 40.4 ×4 = 5127.58mm^2
Front rotors (diam x thk) - 280×30
Rear Caliper Piston(diam x qty) - 38.18×2 = 2289.78mm^2 ratio FR = 2.239
Mounting Hole Diameter: Approx 4.5 inches (confirmation to come soon)
Rear Rotors (diam x thk) - 297×18
total 7417.36 brake to master ratio 14.63


R33 GTST
Master Cylinder diam (mm) - 23.8 444.88mm^2
Front Caliper Piston(diam x qty) - 40.4 ×4 = 5127.58mm^2
Front rotors (diam x thk) - 296×30
Rear Caliper Piston(diam x qty) - 38.18×2 = 2289.78mm^2 ratio FR = 2.239
Rear Rotors (diam x thk) - 297×18
Total area 7417.36mm^2 brake to master ratio 16.67

R32 GTR (Non V-Spec,)
Master Cylinder diam (mm) - 25.4
Front Caliper Piston(diam x qty) - 40.4 ×4
Front rotors (diam x thk) - 296×32
Rear Caliper Piston(diam x qty) - 38.18×2
Rear Rotors (diam x thk) - 297×18

R32 GTR V-Spec / R33 / 34 GTR with Brembos
Master Cylinder diam (mm) - 26.9 568.32mm^2
Front Caliper Piston(diam x qty) - (44+3Cool×2 ... leading pistons smaller then trailing 5309.29mm^2
Front rotors (diam x thk) - 324×30
Rear Caliper Piston(diam x qty) - 40×2 2513.27mm^2 ratio FR = 2.1125
Rear Rotors (diam x thk) - 300×22
total 7822.56 brake to master ratio 13.76

This is the ratio of master piston movement to overall brake pad movement
R32/GTR calliper ratio 15.43
R33/GTR calliper ratio 17.58


https://www.skylineowners.com/threads/disc-sizes.185316/

Car	Caliper Piston Sizes	Rotor Sizes	Pad Sizes	Master Cylinder Size
Silvia 180sx/S13	1x38	258x9	85x43x14	13/16"
Silvia/200sx S14,S15	1x38	258x9	85x43x14	15/16"
300zx Z32 Turbo	2x38	297x18	73x55x16	17/16"
350z Z33 Brembo	2x40	322x22	77x66x13	17/16"
Skyline R32 GTST	2x38	297x18	73x55x16	16/16"
Skyline R32 GTR (NON Brembo)	2x38	297x18	73x55x16	16/16"
Skyline R33 GTS25T	2x38	297x18	73x55x16	15/16"
Skyline R34 GTT	2x38	297x18	73x55x16	16/16"
Skyline R23,R33,R34 GTR Brembo	2x40	300x22	77x66x13	17/16"
Evo 5, 6, 7, 8, 9	2x40	300x22	77x66x13	17/16"
ALPHA OMEGA Brakes: Rear (Evo 350mm Brembo)	2x40	350x20	77x66x13	17/16" recommended

http://alphaomegaracing.com/p/106/c/72/Z32/ALPHA-OMEGA/Evo-350mm-Brembo-Rear-Brake-Adapter-Kit.html