There are 3 types:

• 374mm/345mm rotors, painted 4-fixed piston front calipers (large), 1-sliding piston rear caliper
• 348mm/345mm rotors, painted 4-fixed piston front calipers (medium), 1-sliding piston rear caliper
• 348mm/345mm rotors, unpainted 4-fixed piston front calipers (small), 1-sliding piston rear caliper

 

And you can buy a 18” M performance brake with different rotors.

BMW M Performance Nachrüstsatz 18" Sportbremse - LEEBMANN24

www.leebmann24.de

 

I am sad that, to get the bigger discs and calipers, I need to also get the bigger wheels. I may swap to smaller wheels later, if I can get suitably wide tires.

 

The M Performance brake kit is the same 374mm OEM brake setup of the 20” wheel option, but with slotted/dimpled rotors. And can be used with 18” wheels with wide barrels.

 

Are the calipers cast iron or AL?

 

Aluminum fixed-piston, iron sliding-piston calipers.

 

On a similar note, do you guys know if the brake kit on the e40 with Msport is the same size as the one on the M50? From the images on the web portal they "look" like the same brakes however, it doesn't give any details specifically.

 

The e40 has the small brake setup standard in the USA; the M50 has the medium setup (2NH) standard, and the big brake setup (33T) optional.

 

Ah I see. Darnit, was hoping it would look more closer to the image that the configurator gave me. Looks so much more meatier. ha ah well. Thank you sir!