Will the M2 Competition upgraded steel brakes option fit the M3/M4?

[Encanto]

Originally Posted by BlackJetE90

I may be mistaken but the M2 Competition upgraded brakes look to be F8x CCB calipers with 400mm/380mm iron rotors.

Not only should they be a direct fit for an upgrade of standard brakes, but also an oem iron rotor option for CCB owners.

Yes, we already stated that. What is not compatible is the CCB brake booster with these iron rotors.

[Encanto]

Originally Posted by Frode D

These are the accessory 2NH for the regular M2 (and M3/M4). M2 Competition brakes are the same but with matte grey calipers.

[hellrotm]

Originally Posted by Encanto

Yes, we already stated that. What is not compatible is the CCB brake booster with these iron rotors.

The N55 M2 has the same brake booster part number as the M3/M4 with CCB...part#34337849876. Since the M2C Red Mperf brakes are also for the N55 M2, that would make the CCB brake booster the correct part for the new brake package. M3/M4’s with standard brakes are the ones with the wrong booster. Even though the N55 M2 and M3/M4 share standard brakes, N55M2 uses CCB brake booster.

Current M2
https://www.etkbmw.com/bmw/EN/search...M2/ECE/34_2206

M4 standard and CCB
https://www.etkbmw.com/bmw/EN/search...M4/ECE/34_2206

[domino_z]

Originally Posted by BlackJetE90

The N55 M2 has the same brake booster part number as the M3/M4 with CCB...part#34337849876. Since the M2C Red Mperf brakes are also for the N55 M2, that would make the CCB brake booster the correct part for the new brake package. M3/M4’s with standard brakes are the ones with the wrong booster. Even though the N55 M2 and M3/M4 share standard brakes, N55M2 uses CCB brake booster.

Current M2
https://www.etkbmw.com/bmw/EN/search...M2/ECE/34_2206

M4 standard and CCB
https://www.etkbmw.com/bmw/EN/search...M4/ECE/34_2206

that's interesting

so given the M2 N55 uses M3/4 brake hardware, is the brake booster even that important

as someone with a ceramic retrofit kit to fit, i might try them on road before dealing with the hassle of swapping the booster out

[mynameisplayer]

What pad is the important question?! What pad will fit this - other than what BMW will sell? Is it a Brembo OEM that has steel and CCB options?

[Encanto]

We do not know yet the M2 Competition (2NH grey calipers) or the 2NH accessory (red calipers) included brake booster P/N will be. Neither if the M2 accessory 2NH kit will be fully OEM applicable to the M3/M4. All depends on the brake booster P/N included in those kits.

What we may conclude is that the M2 Competition caliper and rotors will fit the M3/M4 as M2 calipers and rotors are the same P/N as in the M3/M4. This is assuming that the M2 caliper mounting points (front struts and rear mount) and hubs are not changed for the M2 Competition.

What we do know conclusively is that the M3/M4 brake booster is different between the CCB and the standard iron rotors, and the accessory CCB conversion includes the correct CCB brake booster. So using steel rotors with the CCB brake booster may be supported in the M2 ETK, but it is not supported in the M3/M4 anywhere so far.

Originally Posted by BlackJetE90

The N55 M2 has the same brake booster part number as the M3/M4 with CCB...part#34337849876. Since the M2C Red Mperf brakes are also for the N55 M2, that would make the CCB brake booster the correct part for the new brake package. M3/M4’s with standard brakes are the ones with the wrong booster. Even though the N55 M2 and M3/M4 share standard brakes, N55M2 uses CCB brake booster.

Current M2
https://www.etkbmw.com/bmw/EN/search...M2/ECE/34_2206

M4 standard and CCB
https://www.etkbmw.com/bmw/EN/search...M4/ECE/34_2206

[Encanto]

Originally Posted by mynameisplayer

What pad is the important question?! What pad will fit this - other than what BMW will sell? Is it a Brembo OEM that has steel and CCB options?

D1648-1 front and D1155 rear.

[hellrotm]

Originally Posted by Encanto

We do not know yet the M2 Competition (2NH grey calipers) or the 2NH accessory (red calipers) included brake booster P/N will be. Neither if the M2 accessory 2NH kit will be fully OEM applicable to the M3/M4. All depends on the brake booster P/N included in those kits.

What we may conclude is that the M2 Competition caliper and rotors will fit the M3/M4 as M2 calipers and rotors are the same P/N as in the M3/M4. This is assuming that the M2 caliper mounting points (front struts and rear mount) and hubs are not changed for the M2 Competition.

What we do know conclusively is that the M3/M4 brake booster is different between the CCB and the standard iron rotors, and the accessory CCB conversion includes the correct CCB brake booster. So using steel rotors with the CCB brake booster may be supported in the M2 ETK, but it is not supported in the M3/M4 anywhere so far.

The current M2 contradicts a lot of the arguments about correct brake booster. As we do know the current M2(with the standard M4 brakes) uses the M4 CCB brake booster. My suspicion is the 2NH accessory (red calipers) will not come with a brake booster for current M2 owners, as they already have the CCB part number. If true M4 CCB owners theoretically will be able to use the iron rotors. Brake boosters is usually more correlated to caliper and piston size, rather than rotor type. The CCB conversion kit has a upgraded brake booster because of the caliper upgrade, it needs more force for increased piston count/size. M2 basically has an overkill brake booster for the blue standard brakes. M3/M4 owners with standard blue brakes, will be the ones that need a CCB brake booster for either 2NH or CCB conversion.

[Encanto]

Originally Posted by BlackJetE90

The current M2 contradicts a lot of the arguments about correct brake booster. As we do know the current M2(with the standard M4 brakes) uses the M4 CCB brake booster. My suspicion is the 2NH accessory (red calipers) will not come with a brake booster for current M2 owners, as they already have the CCB part number. If true M4 CCB owners theoretically will be able to use the iron rotors. Brake boosters is usually more correlated to caliper and piston size, rather than rotor type. The CCB conversion kit has a upgraded brake booster because of the caliper upgrade, it needs more force for increased piston count/size. M2 basically has an overkill brake booster for the blue standard brakes. M3/M4 owners with standard blue brakes, will be the ones that need a CCB brake booster for either 2NH or CCB conversion.

The brake booster unit difference is to compensate for the higher friction coefficient of the CC rotors according to BMW OEM documentation. Note that the F10 M5 uses the same front/rear calipers regardless of CCB/iron rotors (CCB rotors are 10mm bigger in diameter which a bigger pad size takes care of), however the brake booster is different. So the rotor composition is the difference, not the calipers or piston count.

Which means that BMW found something about brake boost/balance in the M2 particular chassis that required a less potent booster than in the M3/M4 with the same exact iron rotors and 4/2-piston calipers brakes.

[hellrotm]

Originally Posted by Encanto

Which means that BMW found something about brake boost/balance in the M2 particular chassis that required a less potent booster than in the M3/M4 with the same exact iron rotors and 4/2-piston calipers brakes.

More potent, the M2 has the CCB brake booster with 4/2 caliper brakes.

Or are you saying the CCB brake booster is less potent?

[Encanto]

Originally Posted by BlackJetE90

More potent, the M2 has the CCB brake booster with 4/2 caliper brakes.

Or are you saying the CCB brake booster is less potent?

Higher coefficient of friction CC rotors means less boost is needed to perform equal braking force compared to iron rotors. Notice that what BMW is referring to is friction, not brake feeling or bias, when iron and CCB brakes are compared.

It would be interesting for BMW to explain why they use this particular booster in the M2 but not in the M3/M4.

[M4_GTS]

Originally Posted by Encanto

Higher coefficient of friction CC rotors means less boost is needed to perform equal braking force compared to iron rotors. Notice that what BMW is referring to is friction, not brake feeling or bias, when iron and CCB brakes are compared.

It would be interesting for BMW to explain why they use this particular booster in the M2 but not in the M3/M4.

because the m2 is lighter and the need for less braking force is less.

[Oreganoflow]

my bad if i missed this, but are these 380, 395 or 405mm?

[lemetier]

Originally Posted by PayamFSU

Will these be a direct bolt on for us? Anyone know?

***Disclaimer***Unofficially/not type approved, so far.

That said, I've not come across anything preventing the physical installation. Without support from M GmbH however, intensive programming/coding/adaptation and competency necessary to do those steps.

Originally Posted by CanAutM3

I have a hunch these will also be offered on the M4 soon.

50/50. Requires Amended Type Certification to officially offer it and the EOP clock is running.

Originally Posted by BlackJetE90

The N55 M2 has the same brake booster part number as the M3/M4 with CCB...part#34337849876. Since the M2C Red Mperf brakes are also for the N55 M2, that would make the CCB brake booster the correct part for the new brake package. M3/M4's with standard brakes are the ones with the wrong booster. Even though the N55 M2 and M3/M4 share standard brakes, N55M2 uses CCB brake booster.

Current M2
https://www.etkbmw.com/bmw/EN/search...M2/ECE/34_2206

M4 standard and CCB
https://www.etkbmw.com/bmw/EN/search...M4/ECE/34_2206

CCB Brake Servo/DSC Hydropump can be recalibrated, programmed and encoded MANUALLY if necessary.

M2, M3/4 Iron, M4 GTS (CCB), and M235iR all use the same brake servo. M3/4 all variants with CCB (excl GTS) do use a different servo.

[JLS_397K]

According to RealOEM.com, the brake booster for M2 is definitely the same part/number as M3/M4 with CCB rotors. That being said, perhaps we should also consider that BMW already had plans to put the bigger brakes in the M2, according to one of the Executives, they keep track of these forums (WHICH THEY SHOULD FOR HONEST OPINIONS), its been known that BMW Brakes, are good for beginners and occasional track days, but for some of us, they just don't hold up to repetitive heavy track days.

[lemetier]

Originally Posted by JLS_397K

According to RealOEM.com, the brake booster for M2 is definitely the same part/number as M3/M4 with CCB rotors. That being said, perhaps we should also consider that BMW already had plans to put the bigger brakes in the M2, according to one of the Executives, they keep track of these forums (WHICH THEY SHOULD FOR HONEST OPINIONS), its been known that BMW Brakes, are good for beginners and occasional track days, but for some of us, they just don't hold up to repetitive heavy track days.

M3/4 (non GTS) with 2NK (MCCB) : 34 33 7 850 999

M235i ECE with 9ML (Racing Manufacture): 34 33 7 850 999

M2 (All): 34 33 7 849 876

M3/4 (standard Brakes): 34 33 7 849 876

M4 GTS (MCCB): 34 33 7 849 876

M235iR (US): 34 33 7 849 876

[JLS_397K]

Originally Posted by lemetier

M3/4 (non GTS) with 2NK (MCCB) : 34 33 7 850 999

M235i ECE with 9ML (Racing Manufacture): 34 33 7 850 999

M2 (All): 34 33 7 849 876

M3/4 (standard Brakes): 34 33 7 849 876

M4 GTS (MCCB): 34 33 7 849 876

M235iR (US): 34 33 7 849 876

Are you sure you are looking at right part numbers?

[lemetier]

Originally Posted by JLS_397K

Are you sure you are looking at right part numbers?

Yup. Notice the supplement remark for 34 33 7 849 876 is S2NKA = NO in your first pic.

[JLS_397K]

Originally Posted by lemetier

Yup. Notice the supplement remark for 34 33 7 849 876 is S2NKA = NO in your first pic.

Okay so what are you saying, because the way im reading it, your reply is contradicting.

. Im putting pictures showing that the brake booster is the same in M2 and M3/M4 with CCB... even the M4 GTS has same part number. But the brake booster in a standard blue iron brake rotor package on a M3/M4 is different.

What am i missing?

[lemetier]

Originally Posted by JLS_397K

Okay so what are you saying, because the way im reading it, your reply is contradicting.

.What am i missing?

Contradicting what?

Seeing now?

[JLS_397K]

Originally Posted by lemetier

Contradicting what?

Seeing now?

Okay, well your lack of words and just putting numbers is what is confusing...

You wrote "M2, M3/4 Iron, M4 GTS (CCB), and M235iR all use the same brake servo. M3/4 all variants with CCB (excl GTS) do use a different servo." What variants, there are only two, Iron Rotor or Carbon Ceramics.

**Standard M3/M4 (Convertible) Blue/ Iron Rotors have the ...999 part number brake servo.

M2= 876.
M3/M4 WITH CCB = 876
M4 GTS = 876

Long Story Short, M2 has always had bigger/better booster.

[lemetier]

Originally Posted by JLS_397K

Okay, well your lack of words and just putting numbers is what is confusing...

You wrote "M2, M3/4 Iron, M4 GTS (CCB), and M235iR all use the same brake servo. M3/4 all variants with CCB (excl GTS) do use a different servo."

Standard M3/M4 (Convertible) Blue/ Iron Rotors have the ...999 part number brake servo.

M2= 876.
M3/M4 WITH CCB = 876
M4 GTS = 876

Long Story Short, M2 has always had bigger/better booster.

You have it backwards. M4 GTS is the odd duck which has MCCB standard but does NOT use a different servo (876 instead of 999).

Long story short, M2 uses the same servo as all the other 4pot front/2 pot rear Iron M Compound/M Sport/M Performance brake systems avail for 1er, 2er, 3er,
and 4er.

I'm not sure how this wasn't clear:

Originally Posted by lemetier

M3/4 (non GTS) with 2NK (MCCB) : 34 33 7 850 999

M235i ECE with 9ML (Racing Manufacture): 34 33 7 850 999

M2 (All): 34 33 7 849 876

M3/4 (standard Brakes): 34 33 7 849 876

M4 GTS (MCCB): 34 33 7 849 876

M235iR (US): 34 33 7 849 876

Originally Posted by JLS_397K

What variants, there are only two, Iron Rotor or Carbon Ceramics.

Model Type Variants?

F80/F80N - M3 Sedan/M3 Sedan LCI
F80N - M3CS Sedan LCI
F82/F82N - M4 Coupe/M4 Coupe LCI
F82N - M4CS Coupe LCI
F82 - M4 GTS Coupe
F82N - M4 GTS Coupe LCI DTM Champions Edition
F82N - M4 GT4 Coupe LCI
F83/F83N - M4 Convertible/M4 Convertible LCI