[johnung]

Originally Posted by terryd5150

I'd love to have those ECS two-piece rotors but they don't sell the same configuration in the rears.

I can't stand mis-matched sets.

If you are talking about the front ECS full floating rotors that are drilled and slotted, I would recommend Paragon rotors instead of ECS. See link below.

Paragon makes great track brake calipers and rotors. They also make full floating rotors to fit BMW Front 370mm and 340mm, and also 2-piece to fit Rear 345mm in both 160mm and 185mm emergency brakes.

Paragon replacement rotor rings are much more reasonably priced than others.

Paragon rotors come slotted as standard because they are oriented to track customers. But for a cheap $50 fee, they can custom make any configuration. I highly recommend full crossdrilled for street cars which is what BMW installs on M3/M4 and so do Porsche, Mercedes, McLaren etc on their street performance cars.

The reason that there aren’t stock sized Rear 345mm full floating rotors is because BMW utilizes a rear emergency brake that is machined inside the rotor hat. Paragon comes the closest with a lightweight 2-piece rear rotor that has the same replaceable rotor ring. Both they have to use a steel insert inside the rotor hat to accommodate the emergency brake. So it appears to be full floating but the hat and the rotor ring are actually bolted to each other. Great design and allows matching of front and rear rotor surface configurations.

https://paragonbrakes.com/bmw/m-perf...e-m-sport-fxx/

[Eschmacher]

Originally Posted by johnung

About five years ago a BMW tech upgraded me to F340/R345 (and a few years later to F370/R345). At the time he said that the P377A F340/R330 configuration came with the same coding on the car (which I assume is the 2NH that you mentioned) from the factory as the Blue M Sport Brake factory option S2NHA F370/R345. So he said no coding change was needed.

Could be maybe a difference in the year/config? Mine is a 14' 335i with P337A, and it definitely made the changes I mentioned when I tried out both 2NH and SPBR.

The only difference between 2NH and SPBR coding on my car were the "tandem brake cylinder" values. SPBR left the value unchanged from stock, while 2NH had different values. This seems to imply that the 2NH cars ship with a different master cylinder, but I can't find any evidence to back that up. Realoem literally only shows one master cylinder for all 335i's, no matter what options they have. So I have no idea what that's about...
You have to figure the engineers must have made this distinction for something??

[rlesko]

Originally Posted by Eschmacher

Could be maybe a difference in the year/config? Mine is a 14' 335i with P337A, and it definitely made the changes I mentioned when I tried out both 2NH and SPBR.

The only difference between 2NH and SPBR coding on my car were the "tandem brake cylinder" values. SPBR left the value unchanged from stock, while 2NH had different values. This seems to imply that the 2NH cars ship with a different master cylinder, but I can't find any evidence to back that up. Realoem literally only shows one master cylinder for all 335i's, no matter what options they have. So I have no idea what that's about...
You have to figure the engineers must have made this distinction for something??

I just realized something- there must be at least two cylinder variants for 318,320,328, and 335 right?

Because the MPBBK can be put on any F chassis car. This means there needs to be a single way to code this retrofit that works for all F chassis thats independent of the hardware flavors.

So its possible that 2NH would be fine on a 335, but not on different chassis.

[Eschmacher]

Originally Posted by rlesko

I just realized something- there must be at least two cylinder variants for 318,320,328, and 335 right?

Because the MPBBK can be put on any F chassis car. This means there needs to be a single way to code this retrofit that works for all F chassis thats independent of the hardware flavors.

So its possible that 2NH would be fine on a 335, but not on different chassis.

Realoem only lists one master cylinder part number for all US pre-lci models except the 320i/x. That one has part number 34336851093 for the base model and lists 34336851095 (the one every other car gets) as the part number for 2NH.

[rlesko]

Originally Posted by Eschmacher

Realoem only lists one master cylinder part number for all US pre-lci models except the 320i/x. That one has part number 34336851093 for the base model and lists 34336851095 (the one every other car gets) as the part number for 2NH.

This would potentially confirm my suspicion then- as you can certainly buy the MPBBK on a 320i and would need compatible coding / install instructions that bridge 320i and 328i/335i.

[SGoodman23]

Originally Posted by johnung

Paragon has the best bang for the buck brake upgrades for the F3x. Less expensive and more versatile than either BremboGT or StopTech BBK. Paragon makes full crossdrilled [...]

johnung curious were you only talking Paragon rotors or their BBK? I contacted their customer rep and they said their kit has been installed on several E and F chassis 3 series and is designed to work with all the OEM components (master cylinder, ABS, etc). They also said if you only upgrade the front but not rear it won’t create brake imbalance as it was specifically designed to be compatible with OEM rears if not upgrading—something I’ve read others mention on the forums about other BBK upgrades.

I haven’t seen anyone on this forum review the brake kit so interested in any feedback.

The current August 2024 prices for a MBBK and Paragon front BBK are comparable, though you miss out on any rear caliper upgrade with Paragon, so not quite apples to apples.

[johnung]

Originally Posted by SGoodman23

johnung curious were you only talking Paragon rotors or their BBK? I contacted their customer rep and they said their kit has been installed on several E and F chassis 3 series and is designed to work with all the OEM components (master cylinder, ABS, etc). They also said if you only upgrade the front but not rear it won’t create brake imbalance as it was specifically designed to be compatible with OEM rears if not upgrading—something I’ve read others mention on the forums about other BBK upgrades.

I haven’t seen anyone on this forum review the brake kit so interested in any feedback.

The current August 2024 prices for a MBBK and Paragon front BBK are comparable, though you miss out on any rear caliper upgrade with Paragon, so not quite apples to apples.

Yup the stuff you said is true. I think highly of both Paragon calipers/rotors and their replacement full floating rotors that fit the front Brembo 370’s and 340’s.

I would order them from Paragon in full crossdrilled with anti-rust coating for a street car. There are M2 F87 guys using Paragon. Much more cost effective for tracking than AP Racing brakes. See photo of a friend’s rear Paragon brakes for his M2 daily/track car.

[SGoodman23]

Thanks. Super helpful. Leaning toward the Paragon front BBK and just replacing OEM rotor and pads in the back. Will probably look awkward because I’ll probably just have blanks in the back but not overly concerned with looks. I still need to double check fitment. I have Apex ARC-8, 18x18.5 ET 38 and the rep thinks it should fit but said to go through the fitment guide.

[SD Convert]

Originally Posted by johnung

The following F3x brake combinations all utilize the same coding. So moving from one to another does not require coding.

Front 370x30, Rear 345x24
Front 340x30, Rear 345x24
Front 340x30, Rear 330x20

Just to be complete, you might want to add the following configuration that some people are upgrading to. This upgrade requires use of adapters from SLG or Kern and allows use of the M3/M4 (F8x) rotors. The SLG will also fit some aftermarket rotors. This uses the same coding as the 370/345 rotors.

Front 380x30, Rear 370x24