I installed Evo9 brembo calipers on my FN2 + custom 330mm 2-part rotors, blue stuff pads. The feel is good and I can feel the potential, but I always need to double tap the brake pedal to presurize calipers.The pistons on Brembos are about 30% bigger so there is need for more brake fluid in calipers. Here are the specs (evo brembos vs stock FN2):
FN2 stock 1pot (dia: 54):
Total piston area per caliper: 45,78 cm2
Total pad area per caliper: 142 cm2
Evo7-9 Brembo 4pot (dia: 46, 40):
Total piston area per caliper: 58,34 cm2 (+27%)
Total pad area per caliper: 196 cm2 (+38%)
As you can see the brembos have huge potential over the stock FN2 calipers, but need more brake fluid. The question is what can I do to improve pedal feel? Can anyone advice what brake master cylinder should I use / where to buy it?
Another possible solution would be some kind of pressure regulator in calipers (banjo bolts):
This should keep more brake fluid inside the calipers and so reduce the need of double tap the brake pedal = make the pedal firm.