Official E89 Factory Brake Upgrade Chart

[LittleBlackHawk]

Originally Posted by vadonchez

Still trying to found answer about the possibility to put 4 spot brembo caliper from F30 M sport car on my Z4 35is 348x30 rotors

Idea is to keep unsprung mass as low as possible but improve calipers.

From what I can read from realoem, 4 spot F30 caliper are 1.5kg lighter than Z4 35is one spot oem caliper.
Add some ECStuning lightweight rotor wich add 1.2kg gain per side and i could expect to gain up to 2.5kg of unsprung weight per side!!
That could make a difference in ride quality.

Please if someone has the answer, let me know.

No, that is not possible unless you make custom brackets. But it is also pretty hard to make custom brackets on these F calipers due to very little space.
So in general, no. However, you can get the 370mm version F calipers and install the 370mm rotors.

[Steve Jarvis]

I thought I would add this information. I saw people adding front rotors/calipers without a rear upgrades and worried about the brake bias implications. I've done in excess of 10,000 track miles with half of those in a heavily modified MKIV Supra. I went through several brake configurations over the years and have a basic understanding of some of the pitfalls. Adding larger rotors and pads help with heat management and rotor/pad life, but adding more front brake bias is not good. You spend a meaningful amount time at less than 100% braking (trail braking) and this puts a greater load on the front brakes and reduces rear brake pressure. This uses less of the rear tire contact patch and can actually lengthen stopping distances. In most cases you want to add more rear bias to reduce stopping distances. Because of this, I decided to run some basic calculations to understand the impact of the BMW 135 front brake "upgrade" used by many. Don't get to caught up in the actual numbers as I used some basic assumptions for the pedal ratio, master cylinder piston diameter and resulting line pressure. The differences are more important. The good news is though the 135 front brakes have larger diameter rotors (more leverage) and visually larger caliper, the actual brake torque is less than the stock 35i front brakes. This means 135 front brakes and 35i rear brake are a nice street setup with the ability to dissipate more heat than the stock brakes and still have good brake balance. Using the 135 front brakes with the stock 35is rear brakes actually keeps the bias almost identical to the stock 135 and Z4 35is setup. Please let me know if I have any of the specifications for the rotor or piston diameters incorrect and I will update the sheet.

[sangers]

Hi all. Sorry if this has been mentioned , I couldn’t find it in this thread. Has anyone tried fitting M240i brake calipers? Are they the same as M235i?

[B21]

No mention from anyone of coding ‘performance brake’ option in VO?

Discuss!

[B21]

Trial fit of 380 mm 30 mm M4 disc with series 4 pot caliper..

Caliper looked big in isolation..not looking so big now!

[MRCW]

Originally Posted by B21

No mention from anyone of coding ‘performance brake’ option in VO?

Discuss!

I am starting to explore this as I'm working on my 2013 X1 35i MSport build to light track car...

I think there are more mods to do with DSC module and others...i think the biggest issue is the initial brake feel...

Certainly would be interested in what is offered for the Z4 as tweaks but I'm not really interested in addtional part replacement performance mods for my Z4 other than the simple stage 1 MHD tune

[B21]

Originally Posted by MRCW

I am starting to explore this as I'm working on my 2013 X1 35i MSport build to light track car...

I think there are more mods to do with DSC module and others...i think the biggest issue is the initial brake feel...

Certainly would be interested in what is offered for the Z4 as tweaks but I'm not really interested in addtional part replacement performance mods for my Z4 other than the simple stage 1 MHD tune

You ‘just’ code the performance brake option ‘on’ in the vehicle order..Simple’s

[MRCW]

Originally Posted by B21

You ‘just’ code the performance brake option ‘on’ in the vehicle order..Simple’s

Without any parts enhancements what does this get you in performance enhancements?

Just code it in thy VO? that's all?

[B21]

Originally Posted by MRCW

Without any parts enhancements what does this get you in performance enhancements?

Just code it in thy VO? that's all?

Well the increased mass and better cooling of the rotor should improve heat fade..

The bigger swept area and bigger area pad should offer increaed friction

Apart from coding on an E89 there's not much you can do..the brake servo isn't interchangeable..

All E89s run the same servo irrespective if the sizes of the front and rear stock brakes..from 300 mm front and 284 rear through to 348 and 300 rear