DIY: F30 M Performance Brakes on E90 E92 E93 Guide

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fmorelli

Brigadier General
Staff member
Aug 11, 2017
2,577
Virginia
From a buying perspective, know that Brembo stamps the rotor size application on the back of the rotor. So F8x M3/M4 and F3x m-sport blue calipers are the same - stamped "370/380" on that back which is 380mm on F8x and 370mm on F30.

Screen Shot 2020-01-13 at 1.40.59 PM.png



This is from my working spreadsheet, which is hopefully correct. Shopping hint ... some times dismantlers will list part by model. So a wrecked F32 435i runs that same part number.

One other thing ... buying the finished blue calipers undamaged is no easy feat. Many get damaged by the dismantler, so take that into consideration when making the purchase. For those buying blue calipers, paint code 335 (Estoril Blue) will give you touch-up.

F80 M3 / F82 F83 M4 / F87 M2
left caliper34116799469superseded by 34116875649
carrier left31212284001
rotor34112284809380x30mm
F30 / F31 / F32 / F36
left caliper(same as F8x)370/380mm caliper application
carrier left31216792287
M-sport rotor34106797603370x30mmNote stock rear is 345x24mm
Brembo 2-piece (OE)09.C394.13OE (I believe) for BMW - dimple/slotted
Pagid 2-piece355120831
Centric slotted dimpled rotor12634142370mmx30mm
Zimmerman 1-piece34106797603370x30mm
Zimmerman 2-piece34106797602Formula F
XYZ
A few photos at my end, with the last being a bit of a teaser. :)





Filippo


IMG_20200104_175759.jpg



IMG_20200104_175827.jpg


IMG-20200105-WA0001.jpg
 
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doublespaces

Administrator
Oct 18, 2016
8,067
AZ
Perhaps Turner's documentation was written before that was available.

In this case, I'd suggest using the correct rotors or selling them and getting the calipers you need. The bushing made for the rears is a small compromise and people do it because there aren't any inexpensive alternatives.

If someone doesn't make a bush for the front the other option would be to have the ears milled off and have new ones made, but that isn't cost effective either.

Having the correct fitment on front would probably be more comforting as the offset bush might be more prone to deformation on heavy braking.
 

fmorelli

Brigadier General
Staff member
Aug 11, 2017
2,577
Virginia
Are you doing some sort of knuckle conversion?
Good eye. Yes a carrier conversion. But I don't want to jump the gun on that until we've made enough progress that I can share information instead of misinformation :). We're probably a month out on that. @[email protected] is about to get a bunch of CAD drawings out to sendcutsend to make some things we need for the whole rigamarole.

Filippo
 
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Illsic_Design

Lurker
Feb 2, 2018
12
There are blue calipers from OEM that are 340, so probably shouldn't tell people if they are blue they are for 370/380. On the back of the caliper it usually says either 340 if they are for 340, or either 370 or 370/380 if they are for those. If they are grey and unmarked then they are almost 100% 340.


But back to the question, I don't know of anyone selling brackets or that has used 340 calipers with the 370 rotors, think you are either going to have to use the 340 rotors or sell them and buy the correct calipers.
 
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doublespaces

Administrator
Oct 18, 2016
8,067
AZ
There are blue calipers from OEM that are 340, so probably shouldn't tell people if they are blue they are for 370/380. On the back of the caliper it usually says either 340 if they are for 340, or either 370 or 370/380 if they are for those. If they are grey and unmarked then they are almost 100% 340.
At the time of writing in the referenced link, the calipers you are talking about did not exist.

@Illsic_Design, my research leans to grey calipers not being 370. If you've seen something that may be otherwise, I'd be curious to know.
I've never seen them personally but apparently they do exist, though I wouldn't buy a pair hoping to get them.
 
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Wheelz

New Member
Jan 12, 2020
5
I have a 335is standard front rotor size is 348mm I cant justify going down to a 340mm front with a 345mm rear but apparently bmw did that on the 2series sport caliper go figure
 

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