03-20-2024, 01:55 PM | #1 |
Second Lieutenant
184
Rep 234
Posts |
340mm M Sport brake discs
I’m due to replace the front discs at some point this year, and I have the blue M Sport (Brembo) calipers with the M Sport 340mm discs.
This has probably been asked before but will the 370mm discs fit without changing anything else? I run 19” wheels (both summer & winters) so I know they will fit over 370mm discs. However (& I think I know the answer) but will the discs fit the caliper spacing or will it need new caliper carriers? I really do like the look of Vagbremtechnic discs:- https://performancem.co.uk/choose-yo...msport-brakes/
__________________
2016 BMW 335d M Sport xDrive Touring
|
03-20-2024, 03:10 PM | #2 |
Idiotic lifter of heavy stones...
2318
Rep 2,497
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
No
The 340mm calipers will only take the 340mm discs You need the 370/380mm calipers to up the disc size Re wheels - every 18" wheel for the F3x range fits over the 370/345mm brakes. So your 19s won't have any issues
__________________
My car: 2015 F31 325D M Sport Touring in Glacier Metallic Silver - Keeping it OEM 'Plus'
Project: https://f30.bimmerpost.com/forums/sh....php?t=1982298 |
Appreciate
0
|
03-20-2024, 04:12 PM | #4 |
Idiotic lifter of heavy stones...
2318
Rep 2,497
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
No worries
You could always go for something like these: https://www.darksidedevelopments.co....&isp_ref_pos=3 I run the dimpled/slotted OEM BMW discs on my F31 with the 370/345mm brake set up and find them to be very good indeed (OEM pads also) Just wish I'd seen this time last year when I was getting them all together that the M3/M4 pads were a decent upgrade if sticking with OEM BMW etc Would a full upgrade to the 370mm calipers be an option?
__________________
My car: 2015 F31 325D M Sport Touring in Glacier Metallic Silver - Keeping it OEM 'Plus'
Project: https://f30.bimmerpost.com/forums/sh....php?t=1982298 |
Appreciate
1
Jon TDI184.00 |
03-20-2024, 04:49 PM | #5 | |
Second Lieutenant
184
Rep 234
Posts |
Quote:
Full 370mm upgrade may well blow the budget if new calipers are required. Plus there is nothing wrong with the current calipers. Just discs & pads for now.
__________________
2016 BMW 335d M Sport xDrive Touring
|
|
Appreciate
1
danb19792318.00 |
03-21-2024, 01:32 PM | #7 | |
Second Lieutenant
184
Rep 234
Posts |
Quote:
A mind numbing bland hatchback would do the same job…….but what’s the fun in that?
__________________
2016 BMW 335d M Sport xDrive Touring
|
|
03-21-2024, 02:08 PM | #8 | |
Idiotic lifter of heavy stones...
2318
Rep 2,497
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
Quote:
And IMO; they look good with the blue Brembo brakes and aid in keeping the pad faces that bit less glazed than they can do with blank discs etc
__________________
My car: 2015 F31 325D M Sport Touring in Glacier Metallic Silver - Keeping it OEM 'Plus'
Project: https://f30.bimmerpost.com/forums/sh....php?t=1982298 |
|
Appreciate
1
Jon TDI184.00 |
03-21-2024, 02:22 PM | #9 | |
Second Lieutenant
184
Rep 234
Posts |
Quote:
They took a hammering during a track day session at Donnigton. Brakes felt really rough after that & after inspection, they had started to crack in a few areas from the drilled holes. Never bought drilled discs after that. Dimpled or grooved are fine though.
__________________
2016 BMW 335d M Sport xDrive Touring
|
|
Appreciate
1
danb19792318.00 |
03-21-2024, 04:47 PM | #10 |
Colonel
2392
Rep 2,158
Posts |
Yep, agreed. Some love them but my experience for a daily is that they get corrosion creeping in under the braking surface more easily, make more noise, and wear pads more rapidly. Any slight benefits are offset by those downsides, or at least they are to me.
|
Appreciate
1
ade555167.00 |
03-22-2024, 05:57 AM | #13 | |
Major
1159
Rep 1,467
Posts |
Quote:
Drilling holes in a large metal disc that is subjected to 1000s of heat cycles is a dumb idea as it just creates loads of stress risers. Even the Porsche ones - which allegedly have cast holes - crack. OEM drilled/cast holed rotors last considerably longer than aftermarket ones though to be fair. |
|
03-22-2024, 06:12 AM | #14 | |
Second Lieutenant
184
Rep 234
Posts |
Quote:
__________________
2016 BMW 335d M Sport xDrive Touring
|
|
Appreciate
0
|
03-22-2024, 06:13 AM | #15 | |
Idiotic lifter of heavy stones...
2318
Rep 2,497
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
Quote:
Crazy really and it seems that Porsche love to use them on their cars...! I've never had any issues running dimpled/grooved discs on many cars; some J hook discs are good too (they're a lot louder than grooved discs IMO) But drilled discs are just not required due to the above The OEM BMW discs & pads I run are very quiet indeed; never once have I thought them to be loud. You only really hear them if you're driving in a built up area/past fences at low speeds and even then it's more of a light clicking... Nor are there any issues with corrosion, whatsoever...
__________________
My car: 2015 F31 325D M Sport Touring in Glacier Metallic Silver - Keeping it OEM 'Plus'
Project: https://f30.bimmerpost.com/forums/sh....php?t=1982298 |
|
Appreciate
0
|
03-22-2024, 10:15 AM | #18 | |
Idiotic lifter of heavy stones...
2318
Rep 2,497
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
Quote:
Best way to check is take the wheel off and look on the back of the caliper; it'll say 340 or 370/380 You'll know which brakes you have then... My F31 325D has the 370/345mm brakes - it's all down to what was spec'd from factory etc
__________________
My car: 2015 F31 325D M Sport Touring in Glacier Metallic Silver - Keeping it OEM 'Plus'
Project: https://f30.bimmerpost.com/forums/sh....php?t=1982298 |
|
Appreciate
0
|
03-22-2024, 11:02 AM | #19 | |
Lieutenant Colonel
767
Rep 1,706
Posts |
Quote:
|
|
Appreciate
1
danb19792318.00 |
03-22-2024, 12:55 PM | #20 |
Captain
1341
Rep 735
Posts |
20i will 100% be 340mm.
Front caliper size is directly linked to the engine variant. In the case of M Sport brakes 20d and below get 340mm 20i and below get 340mm 25d and above get 370mm 28i and above get 370mm 30e gets 340mm |
03-22-2024, 01:55 PM | #21 |
Idiotic lifter of heavy stones...
2318
Rep 2,497
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
Never knew that! Thanks
__________________
My car: 2015 F31 325D M Sport Touring in Glacier Metallic Silver - Keeping it OEM 'Plus'
Project: https://f30.bimmerpost.com/forums/sh....php?t=1982298 |
Appreciate
1
blau3er1340.50 |
03-22-2024, 03:31 PM | #22 |
Second Lieutenant
184
Rep 234
Posts |
And 35d?
__________________
2016 BMW 335d M Sport xDrive Touring
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|