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F30 / F31 / F32 / F33 (2012 - current)
The sixth generation 3 series, chassis code F30. 2013 model year 328i and 335i sedans now in production. Read the F30 frequently asked question thread for all your basic question and dive into all the details in the ultimate F30 information thread.

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  #1  
Old 09-21-2013, 09:33 AM
Bret_T Bret_T is offline
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Mein Auto: '14 435i & '03 S2000
M Sport Brakes Question

I was at a local dealership yesterday. They have two 4-Series coupes. One has the optional M Sport Braks and the other doesn't. I looked at them and found that the calipers are the same. In fact, everything looked identical except for the paint color. What's the real difference between the M Sport Brakes and the regular brakes?
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  #2  
Old 09-21-2013, 11:22 AM
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chiefneil chiefneil is offline
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Mein Auto: 2014 335i, 2002 330i
The 4-series might be different, but here's a breakdown of the 3-series I saved from a post over on another forum.

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

Separate Rotor Upgrades
For upgrade of the original brakes with 340mm rotors, one can buy OEM BMW replacement dimpled and slotted rotors.
Front rotor: 340mm = Part Number 34 10 6 797 602

For upgrade of the with 2NH M-Sport Brakes, one can buy OEM BMW replacement dimpled and slotted rotors.
Front rotor: 370mm = Part Number 34 10 6 797 603
or
Front rotor: 340mm = Part Number 34 10 6 797 602

Rear rotor: 345mm (all models) = Part Number 34 20 6 797 598
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  #3  
Old 09-22-2013, 04:14 PM
Bret_T Bret_T is offline
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Mein Auto: '14 435i & '03 S2000
chiefneil, thanks for the detailed explanation. Based on what I saw and the details you've provided, it appears that the front M Sport Brake brakes for the 428i are the same as the regular front brakes for the 435i. Of course there's no way to see if the pads are different.
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