08-07-2023, 02:54 PM | #1 |
Private First Class
127
Rep 159
Posts
Drives: Moonstone F80 M3 6MT
Join Date: Sep 2022
Location: Orange County, CA
|
Just did F80 front rotors last night + Hawk pads. Fairly straight forward especially with the track handling brakes. Just have to replace the caliper bushings and add a spacer thanks to kern417
Now next weekend I’m going to tackle the rear rotors which I’ve heard is more complicated. Has anyone else done this yet? Any pics or videos would help Below are the F80 front rotors on the car and also some of the hardware sent to me for the rear rotors if you’re curious |
08-16-2023, 06:54 AM | #2 |
Lieutenant
212
Rep 522
Posts |
These are the standard blue 370mm M Sport calipers, with bracket/spacer and 380mm rotors? What bushings are you talking about?
What size wheels are you on? Do they clear 18s?
__________________
2017 340i M Sport Alpine White / Coral
Dorch Stg2, CTS catless, xHP, Custom E50 Tuned by Shoup |
Appreciate
0
|
08-16-2023, 01:57 PM | #3 | |
Major
448
Rep 1,372
Posts |
Quote:
There are 4 connections. 2 bolts on the wheel hub, a hydraulic fluid line and, on one caliper, a wear sensor. Of course you have to switch out the rotor as well, and on some cars, the protection plate to allow it properly fit the 345 mm rotor. Additionally you may need a conversion of the rear manual brake depending on the car getting the 2 piston caliper but either than this, not sure what other elements are required. Are there any? It should be easy to figure out using realoem to compare parts. No?
__________________
340i xDrive (F30), 228i (F22), 320 (F30), 325i (E46)
Last edited by casualDIYer; 08-16-2023 at 02:16 PM.. |
|
Appreciate
0
|
08-19-2023, 05:23 AM | #4 |
Idiotic lifter of heavy stones...
2015
Rep 2,195
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
Thought the Blue M Sport calipers fit the F80 380mm discs fine; the caliper even states 370/380 on the rear
Are the rear discs different and don't for the Blue calipers directly? I know the OEM BMW M3 pads are a direct fit
__________________
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
|
08-19-2023, 12:57 PM | #5 | |
Private First Class
127
Rep 159
Posts
Drives: Moonstone F80 M3 6MT
Join Date: Sep 2022
Location: Orange County, CA
|
Quote:
I wish the install was straight forward like the fronts. I tried out the rear adapters last week. You have to shave a relatively large portion of the hub to make space for one of the bolts. The wear and tear overtime might have an effect on the structural integrity of the hub overtime. The other adapters from SLG require shaving a large part of the caliper to also make space for two of the bolts. Not a fan of ruining a perfectly fine caliper either. So I sent the zimmermanns back and ended up ordering stoptech drilled rotors that almost perfectly match the pattern of the zimmermanns, but in 345x24 size which is the regular size for track handling brakes. So even though the rear caliper can support up to 370mm, it’s not as straightforward of a process as I’d like compared to the fronts. |
|
Appreciate
1
danb19792015.00 |
08-19-2023, 12:59 PM | #6 | |
Private First Class
127
Rep 159
Posts
Drives: Moonstone F80 M3 6MT
Join Date: Sep 2022
Location: Orange County, CA
|
Quote:
And yes they clear my 18 inch RI-A’s perfectly. I’m 18x9.5 ET27. 18 inch wheels are required for this conversion |
|
Appreciate
0
|
08-19-2023, 01:39 PM | #7 | |
Idiotic lifter of heavy stones...
2015
Rep 2,195
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
Quote:
I've fitted OEM M Performance discs to my F31; stuck with OEM pads only; but the car is for every day driving, so they perform superbly and look good too However, I know the F80 M3/M4 brake pads are supposed to be that bit better; so I may update to them in the near future
__________________
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
warpaint340126.50 |
08-21-2023, 10:31 AM | #8 | |
Major
448
Rep 1,372
Posts |
Quote:
Mount a 370mm rotor (e.g. M Performance brake kit). The caliper needs to be mounted to allow the pads to grab the entire rotor surface. Now replace that rotor with a 380mm rotor. If the caliper is fixed in place there is no way the rotor could fit. The caliper needs to be moved 10mm forward to accommodate the larger the rotor. To allow 10mm of extra space BMW would either need a new wheel hub or caliper housing, both of which need new parts. Instead, BMW used an eccentric bushing to solve that problem. While the caliper does play a role in slowing the car, it's more the ability of the rotor to change kinetic energy into heat energy. The area of the rotor (including mounting hub) is pi x radius squared or 3.14 x 185^2 vs 3.14 x 190^2 or 107,466 vs 113,354. Given the mounting portion the rotor is the same size, the upgrade to the 380mm gives the car another, roughly, 6,000 square millimetres of rotor to soak up heat. Roughly 5% more area for the cost of two cheap eccentric bushings is a pretty clever solution. The rear, no changes. 80% of the braking is done in the front. The trade off in cost likely wouldn't be worth the upgrade unless you were talking about a race car in which brake bias was required feature.
__________________
340i xDrive (F30), 228i (F22), 320 (F30), 325i (E46)
|
|
Appreciate
1
warpaint340126.50 |
08-21-2023, 10:36 AM | #9 | |
Major
448
Rep 1,372
Posts |
Quote:
BMW 34218099354 (M3/M4) BMW 34216887576 (M Performance caliper) Are the same size and will both fit into the rear blue caliper? It's only about $40 difference where I shop.
__________________
340i xDrive (F30), 228i (F22), 320 (F30), 325i (E46)
|
|
Appreciate
0
|
08-21-2023, 10:59 AM | #10 |
Idiotic lifter of heavy stones...
2015
Rep 2,195
Posts
Drives: 2015 F31 325D M Sport touring
Join Date: Feb 2022
Location: Preston, Lancashire - UK
|
Yes; the F80 M3 pads are the same size and measurements as the pads for the Blue 370/345mm brakes
__________________
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
casualDIYer447.50 |
Post Reply |
Bookmarks |
|
|