[blau3er]

Originally Posted by AndyM340i

Hi Guys,

I know the F97 X3M brake upgrade for the M340i is "plug & play", but what is the minimum wheel size required? I am running standard 19s, and I know the X3M runs 21s. Do 19s provide sufficient clearance for the X3M discs/calipers?

Thanks

Andy

Subjective. For example the 395mm G30 M-Perf set up (same caliper body as X3M) states on the ETK that minimum wheel size is 19".

Each wheel barrel will offer different caliper clearance though - not all 19" alloys are equal in the world of clearance.

On my F31 for example, I have 400mm under 19". OE 19" F3x wheels would not clear my brake set up, but OE 19" F8x wheels did and now I have Apex VS-5RS wheels (again 19") and they offer even more barrel clearance than the stock F8x wheels did!

[AndyM340i]

Originally Posted by blau3er

Subjective. For example the 395mm G30 M-Perf set up (same caliper body as X3M) states on the ETK that minimum wheel size is 19".

Each wheel barrel will offer different caliper clearance though - not all 19" alloys are equal in the world of clearance.

On my F31 for example, I have 400mm under 19". OE 19" F3x wheels would not clear my brake set up, but OE 19" F8x wheels did and now I have Apex VS-5RS wheels (again 19") and they offer even more barrel clearance than the stock F8x wheels did!

Thanks - I really appreciate the response. My NSF caliper bleed nipple has cross-threaded. Its back together now (tap/die) but I cant leave it like that long term. A new caliper from BMW is ~£800 so I'm thinking with that level of expense I may as well do the X3M setup ~£1200 as the car is used extensively on the track/the Ring.

[jaworq]

Originally Posted by blau3er

It’s still worth reminding that if you have a M340i with either the M Technology Package or Track Handling Package, you will already have 374mm front rotors and in that case - the M Performance brake kit will literally change your brake calipers and replace them with identical ones. The only difference would be that the M Perf kit comes with dimpled and slotted rotors.

The M Performance kit is only an upgrade on cars with the 348mm M Sport brakes, or on cars with the stock brakes.

The best upgrade for G20 remains fitting G30 spec 395mm 4 pot calipers and rotors.

You can even fit the X3 ///M specific drilled discs with the 395mm calipers for an even bigger upgrade.

I have read many topics and posts but I'm still missing 2 things when upgrading front m340i 348mm M Sport brakes to M Perf kit comes with dimpled and slotted 374mm rotors:

1. Master Cylinder and Brake Booster - do I need to upgrade them too?
2. coding is required?

Originally Posted by Chubbiejones

You are correct, BMW does not offer the bracket or the mounting hardware separately. I will be purchasing a set of adapters from Tronik

https://www.ebay.com/itm/29490122856...mis&media=COPY

I was able to purchase a set of gently used calipers from a M5 for an extremely low price.

I have read quite a few of your posts on other threads; appreciate all the information you have provided!

It's been a while. Did you do that upgrade to G80 brakes? I'm still thinking whether I should go for M Performance 4-piston brakes or M3 6-pistons + adapters. I guess power and performance of such brakes will be much higher. I did a drag race with an M3 Competition and I also had a chance to compare stopping power from 160 km/h to 0. M3 was far behind during the brake test... I have 348mm 4-piston M Sport brakes on my M340i.

[blau3er]

Originally Posted by jaworq

I have read many topics and posts but I'm still missing 2 things when upgrading front m340i 348mm M Sport brakes to M Perf kit comes with dimpled and slotted 374mm rotors:

1. Master Cylinder and Brake Booster - do I need to upgrade them too?
2. coding is required?

I have no reason to believe that either would be required, since your M340i will already be coded for sport brakes. My understanding from previous posts is that the master cylinder issue is only on cars which were not equipped from factory with the Brembo calipers.

Originally Posted by jaworq

It's been a while. Did you do that upgrade to G80 brakes? I'm still thinking whether I should go for M Performance 4-piston brakes or M3 6-pistons + adapters. I guess power and performance of such brakes will be much higher. I did a drag race with an M3 Competition and I also had a chance to compare stopping power from 160 km/h to 0. M3 was far behind during the brake test... I have 348mm 4-piston M Sport brakes on my M340i.

Best option in the event a 6 pot set up is required, would be to go with F95 X5M 6 pots, which come with a radial bracket and make 6 pots with the 395mm X5M / X3M discs plug and play.

G80 offers a 380mm M disc, but would, as you have seen, require a custom bracket set up.

[Kennethkbh]

Hi, need anyone expertise on this matter. Can the M5 F90 6pot with 380MM rotor fit into the 19" M light alloy wheels Double-spoke style 792 M. Thanks.

[blau3er]

Originally Posted by Kennethkbh

Hi, need anyone expertise on this matter. Can the M5 F90 6pot with 380MM rotor fit into the 19" M light alloy wheels Double-spoke style 792 M. Thanks.

Where are you sourcing brackets to make your suggested set up work?

[rostrata]

Anyone have torque specs for the caliper bolts for the M Perf kit? These look like torque to yield bolts. Read in a couple of other threads that the rears only required torque to yield while the fronts were just torque only. That makes absolutely no sense. Want to get this installed tomorrow but can’t go anywhere with it until I can nail down the specs. Thanks in advance.

[blau3er]

Front
- caliper to hub, torque to 110nm - BMW TIS suggests new bolts be used.
- brake hose to caliper, torque to 17nm
- brake disc retaining screw, torque to 16nm
- bleed nipple, torque to 18nm

Rear
- caliper carrier to hub, torque to 130nm - BMW TIS suggests new bolts be used.
- guide bolt, caliper carrier to caliper - 35nm
- brake hose to caliper, torque to 24nm
- brake disc retaining screw, torque to 16nm
- bleed nipple, torque to 17nm

Wheel bolts after the job - 140nm.

Hope this helps - torques are all taken from the TIS manual.

As a side note, why are you fitting the M Perf kit to an M340i? You will not be increasing the rear brake provision at all, simply changing to red calipers. Furthermore, if your car has the track handling package, you will also not be upgrading the front brake provision either!

[rostrata]

Appreciate the reply! Thanks for all the info. Good stuff. Some of it was already in alignment with some other posts I’ve seen regarding various BMW models. Seems to be a theme here. But good to see the actual numbers. 👍🏻👍🏻

As for why… well, we have some roads here that make “track days” seem rather boring and not very intense. The larger caliper (despite still only being a 4 pot) are great for the increased pad contact patch and greater cooling ability. The rears are definitely the same damn thing. Just different color like you said. But I’m definitely not going to just install half. Paid for the whole set. Cool thing is that ECS is developing 2-piece rotors for the M Performance kit which was a major factor in my decision to go with this over their 2-piece rotor kit for the M Sport brake. M Sports are certainly good. No doubt. They did handle one of those roads without fading. I was shocked. But, they did wind up glazing over pretty badly. Never warped. But not being able to get more than one run in like that is disappointing. Hence, the desire for larger rotors and better cooling. I actually don’t really understand the ZTK package where it speaks of improved cooling. The standard configuration provides plenty of cooling in the channels cut into the front end. But I digress. Thanks again for the info. Lifesaver!

[blau3er]

Originally Posted by rostrata

Appreciate the reply! Thanks for all the info. Good stuff. Some of it was already in alignment with some other posts I’ve seen regarding various BMW models. Seems to be a theme here. But good to see the actual numbers. 👍🏻👍🏻

As for why… well, we have some roads here that make “track days” seem rather boring and not very intense. The larger caliper (despite still only being a 4 pot) are great for the increased pad contact patch and greater cooling ability. The rears are definitely the same damn thing. Just different color like you said. But I’m definitely not going to just install half. Paid for the whole set. Cool thing is that ECS is developing 2-piece rotors for the M Performance kit which was a major factor in my decision to go with this over their 2-piece rotor kit for the M Sport brake. M Sports are certainly good. No doubt. They did handle one of those roads without fading. I was shocked. But, they did wind up glazing over pretty badly. Never warped. But not being able to get more than one run in like that is disappointing. Hence, the desire for larger rotors and better cooling. I actually don’t really understand the ZTK package where it speaks of improved cooling. The standard configuration provides plenty of cooling in the channels cut into the front end. But I digress. Thanks again for the info. Lifesaver!

No problem happy to help.

Well, if you don’t have the track handling package then the fronts will be going from 348mm to 374mm - so certainly a benefit.

[adc]

I have a G29 Z4, sDrive30i with the regular brakes. I've been eyeing a set of M Sport brakes from a G20 330i. I understand the G29/G20 all use the same brakes.

Does the collective think I will need an upgraded master cylinder/vacuum accumulator? Much obliged!

Edit: I found the info - and answer is No. My apologies for the confusion.

[helmet91]

You will need the brakes programmed though.

[eagerbimmer]

how do these compare with brembo gt or AP racing brake kits? kinda split between these 3.

[helmet91]

What’s your end goal? The AP Racing are for track cars…. The Brembo following shortly behind. M Performance don’t seem to have enough aftermarket support.

Aren’t the prices all over the map?

[rostrata]

Originally Posted by helmet91

What’s your end goal? The AP Racing are for track cars…. The Brembo following shortly behind. M Performance don’t seem to have enough aftermarket support.

Aren’t the prices all over the map?

Aftermarket support is actually gaining a bit of traction. Definitely no longer on the back burner.

[blau3er]

Just adding this in here -

Confirmation that the F95 X5M calipers do indeed bolt right up onto the G20 (and rest of the G series range such as G30 G11 G15 G01 etc....)

Tried it on a G20 hub this evening!

[Silvio Duque]

So today isntalled M performance brakes and H&R lowering springs for 330e LCI 2023

Ordered the one with out the brake booster, I did notice that is has the big master cylinder, (27) so I decided to order it, Have no tried myself because the car is in another city , my friend the shop owner send me this images today and told be that the brakes worked perfect so far after so tests.

[dan1111]

Originally Posted by blau3er

Just adding this in here -

Confirmation that the F95 X5M calipers do indeed bolt right up onto the G20 (and rest of the G series range such as G30 G11 G15 G01 etc....)

Tried it on a G20 hub this evening!

Do you have an update here? I am very eager to know how it turned out!

[blau3er]

Originally Posted by dan1111

Do you have an update here? I am very eager to know how it turned out!

I don’t own a G2x car - I have a F31.

I bought these calipers, as my next car will be a G21 LCI. I do some buying and selling of brakes - so I have a G2x knuckle here that enabled the test fit.

They bolt up to the hub with no issue though, and everything lines up perfectly, with the exception of the disc retaining screws - which wouldn’t be an issue at all once the wheels were torqued down.

I’ve got them on eBay at the moment, as it’s likely that it will be some time until I have a G21 purchased!

[panki_86]

Hello.
Few question guys. I have 2020 M340ix with M technology package (in some countries ZTK, option S33T), so i have 374mm front brake rotors.
Since i need to change them, i will want to change them with perforated M performance one. Brake pads are the same part number.
Can i change mine not perforated rotors with M performance one? Do i need to change something else? Did somebody did this upgrade?

[blau3er]

Originally Posted by panki_86

Hello.
Few question guys. I have 2020 M340ix with M technology package (in some countries ZTK, option S33T), so i have 374mm front brake rotors.
Since i need to change them, i will want to change them with perforated M performance one. Brake pads are the same part number.
Can i change mine not perforated rotors with M performance one? Do i need to change something else? Did somebody did this upgrade?

Zero mods required to swap in the M Perf rotors - just buy them and some new pads and you are good to go.

You will see ZERO difference in terms of performance, but they will look much better!

[panki_86]

Originally Posted by blau3er

Zero mods required to swap in the M Perf rotors - just buy them and some new pads and you are good to go.

You will see ZERO difference in terms of performance, but they will look much better!

Thanks for the answer.
I had appointment at dealership yesterday for Service Inclusive and for front and back brake pads. But we saw my rotors are on minimum 34,4mm, so i need to change them.
Prices for M Performance rotors are 40€ more on each rotor, so its not to much
I will put BMW OEM pads at dealership.