But to get you started, some reference from the 3 series board:
Upgraded brakes
01 Caliper housing left 1 34116799469
01 CALIPER HOUSING RIGHT 1 34116799470
F30 – 335i stock 4 piston brakes 370x30 rotors
Original Brakes on "high power" models (335i)
Front rotor: 340mm brake rotor with 4 piston caliper
Rear rotor: 330mm brake rotor with 1 piston caliper
Original Brakes on "low power" models (320i/328i)
Front rotor: 312mm brake rotor with 1 piston caliper
Rear rotor: 300mm brake rotor with 1 piston caliper
M-Sport Brake Option (2NH) (Blue “M” calipers)
Front rotor: 370mm Brake Rotor with 4 pistons (for on "high power" models)
Front rotor: 340mm Brake Caliper with 4 pistons (for "low power" models)
Rear rotor: 345mm Brake Caliper with 2 pistons (on all models)
M-Performance Brake Kit (Yellow, Orange or Red “M” calipers)
For a "high power" car (all that have 4 piston front brake calipers as factory standard):
Sizes are the same as M-Sport 2NH option but all rotors are dimpled and slotted
For a "low power" car (all that have 1 piston front brake calipers as factory standard):
370mm front rotors, 345mm rear rotors - all dimpled and slotted
http://f30.bimmerpost.com/forums/sho...d.php?t=858607
This upgrade is well documented out here and on the web in general