[volcomb]

Other than cost, what’s is the down side to the 550 brake kit?

https://www.getbmwparts.com/oem-part...ed-34112289348

[jrveron]

Originally Posted by volcomb

Other than cost, what’s is the done side to the 550 brake kit?

https://www.getbmwparts.com/oem-part...ed-34112289348

I don't see any downsides, other than you will deviate from stock pads and rotors

I have to admit, I'm not a big fan of dimpled rotors, but bigger rotors should provide better braking and better heat management.

IMO, the X3 M40i should come with bigger rotors from the factory, something like this:

• 348 for the 30i.
• 374 for the M40i.
• 395 for the X3M.

Anyway, I'm still hesitating between the G30 M-performance brake kit and 2-piece rotors in OEM size. Can't decide what's best for my driving style and canyons-like roads.

[Burr001]

Originally Posted by jrveron

I don't see any downsides, other than you will deviate from stock pads and rotors

I have to admit, I'm not a big fan of dimpled rotors, but bigger rotors should provide better braking and better heat management.

IMO, the X3 M40i should come with bigger rotors from the factory, something like this:

• 348 for the 30i.
• 374 for the M40i.
• 395 for the X3M.

Anyway, I'm still hesitating between the G30 M-performance brake kit and 2-piece rotors in OEM size. Can't decide what's best for my driving style and canyons-like roads.

Bigger brakes allow a larger contact area to help cool them down so they do not reach that high temperatures and they can cool down faster than smaller ones. Vented directional curve discs cool down much better than solid ones to help create a air vortex to siphon heat away. 2 Piece rotors help not transfer heat, grooved or drilled discs allow gas formed by pad decomposition to escape the braking contact surface.

[jrveron]

Originally Posted by Burr001

Bigger brakes allow a larger contact area to help cool them down so they do not reach that high temperatures and they can cool down faster than smaller ones. Vented directional curve discs cool down much better than solid ones to help create a air vortex to siphon heat away. 2 Piece rotors help not transfer heat, grooved or drilled discs allow gas formed by pad decomposition to escape the braking contact surface.

Just tell me which one I should buy! Haha!

[5LEEPR_G01]

Originally Posted by jrveron

Just tell me which one I should buy! Haha!

Lol! He’s convinced me that the most optimal route is going to be slotted rotors w/ EBC green stuff (for daily ability). I would imagine you’ll lose at least 1lb of unsprung weight per corner

Burr001 would you mind weighing your new vs old rotors for comparison?

[jrveron]

Originally Posted by 5LEEPR_G01

Lol! He’s convinced me that the most optimal route is going to be slotted rotors w/ EBC green stuff (for daily ability). I would imagine you’ll lose at least 1lb of unsprung weight per corner

Burr001 would you mind weighing your new rotors for comparison?

According to Paragon's website, the fronts weigh 24.9 lbs (11.3 kg) per rotor, and the backs weigh 16.7 lbs (7.55 kg) per rotor. I guess the 2-piece rotors are the best option for the brake-fading feeling I'm getting.

On the other hand, I'm not sure about EBC yellowstuff vs. greenstuff. I had yellowstuff, and I really liked them. I also think that greenstuff will be like OEM pads. I don't know, I keep digging.

[5LEEPR_G01]

Originally Posted by jrveron

According to Paragon's website, the fronts weigh 24.9 lbs (11.3 kg) per rotor, and the backs weigh 16.7 lbs (7.55 kg) per rotor. I guess the 2-piece rotors are the best option for the brake-fading feeling I'm getting.

On the other hand, I'm not sure about EBC yellowstuff vs. greenstuff. I had yellowstuff, and I really liked them. I also think that greenstuff will be like OEM pads. I don't know, I keep digging.

So stock rotors are 27.8lbs in the front and 18.6lbs in the rear. That’s 10lbs of unsprung weight youre losing as well!

I’m seeing more commentary on greenstuff having less brake dust and that’s my main point of contention with this car

[Burr001]

Ok I'm not an expert but here is my take on why I choose this setup. I drive like an asshole 95% and in either traffic or not, doesn't matter. I like to know what I can and can't do, so me upgrading my brakes with the parts I choose will help give me confidence on the street and the track.

I choose 2 piece rotors due to the less heat transfer, less chance of warpage and the fact that I can rebuild them by adding new rings (roughly 600 a new pair). The material of the rotors aren't simply just any metal.

Yes some people like the look, or the price of R1 concepts, I've used the cheap stuff and for what I need them to do they fall short. Most people here driving an X3 are leasing them or using them as a grocery getter and don't need to spend money for what their use is.

SS lines to help with better/firmer pedal feedback and a set of track pads and a set of daily pads as its easy to swap them. The reason I kept stock size was a larger aftermarket support in terms of parts since the Supra and other m40i models share the same calipers. Will larger brakes help?, sometimes just depends on what your driving use will be. Don't have to go extreme with 2 piece rotors but maybe really good pads can give you the performance feel your looking for.

[Burr001]

Originally Posted by 5LEEPR_G01

So stock rotors are 27.8lbs in the front and 18.6lbs in the rear. That’s 10lbs of unsprung weight your losing as well!

I’m seeing more commentary on greenstuff having less brake dust and that’s my main point of contention with this car

Yes green stuff will have less dust than compared to OEM but will still dust not as quickly. You can try red as it is a ceramic pad or any other ceramic pad to lessen cleaning time. I will use Red pads this summer and see how I like them, they say it doesn't have the intiail bite but will have good stopping power.

I haven't tried Yellow yet. Sometimes depending on the road I may not have the time to wait for them to come to temp tbh.

[TXGrey]

Originally Posted by Burr001

Ok I'm not an expert but here is my take on why I choose this setup. I drive like an asshole 95% and in either traffic or not, doesn't matter. I like to know what I can and can't do, so me upgrading my brakes with the parts I choose will help give me confidence on the street and the track.

I choose 2 piece rotors due to the less heat transfer, less chance of warpage and the fact that I can rebuild them by adding new rings (roughly 600 a new pair). The material of the rotors aren't simply just any metal.

Yes some people like the look, or the price of R1 concepts, I've used the cheap stuff and for what I need them to do they fall short. Most people here driving an X3 are leasing them or using them as a grocery getter and don't need to spend money for what their use is.

SS lines to help with better/firmer pedal feedback and a set of track pads and a set of daily pads as its easy to swap them. The reason I kept stock size was a larger aftermarket support in terms of parts since the Supra and other m40i models share the same calipers. Will larger brakes help?, sometimes just depends on what your driving use will be. Don't have to go extreme with 2 piece rotors but maybe really good pads can give you the performance feel your looking for.

Totally agree. My brakes will prob be due this year, and I’m trying to decide how I want to go about them. Following this thread, well, just because. For ME, personally, I will prob go stock/OEM rotors, less dusting pads, but thinking about the SS lines. I truly appreciate brake performance… and quite regularly may just happen to do some rather high speed slow downs (triple digits)… so I’m trying to balance the best of both worlds.

[Crudowns]

Originally Posted by volcomb

Other than cost, what’s is the down side to the 550 brake kit?

https://www.getbmwparts.com/oem-part...ed-34112289348

What size are the front rotors on this set?

[jrveron]

Originally Posted by Burr001

Ok I'm not an expert but here is my take on why I choose this setup. I drive like an asshole 95% and in either traffic or not, doesn't matter. I like to know what I can and can't do, so me upgrading my brakes with the parts I choose will help give me confidence on the street and the track.

I choose 2 piece rotors due to the less heat transfer, less chance of warpage and the fact that I can rebuild them by adding new rings (roughly 600 a new pair). The material of the rotors aren't simply just any metal.

Yes some people like the look, or the price of R1 concepts, I've used the cheap stuff and for what I need them to do they fall short. Most people here driving an X3 are leasing them or using them as a grocery getter and don't need to spend money for what their use is.

SS lines to help with better/firmer pedal feedback and a set of track pads and a set of daily pads as its easy to swap them. The reason I kept stock size was a larger aftermarket support in terms of parts since the Supra and other m40i models share the same calipers. Will larger brakes help?, sometimes just depends on what your driving use will be. Don't have to go extreme with 2 piece rotors but maybe really good pads can give you the performance feel your looking for.

Thanks! I'm in the same boat. I like to push my X3 as if I robbed it, haha. So, I appreciate your input because I'm looking pretty much the same: better braking performance. I do like how bigger brakes look, but I would probably stay with OEM size for now and see if it works for me.

[jrveron]

Originally Posted by Crudowns

What size are the front rotors on this set?

395 front, 370 back.

More info here:https://www.turnermotorsport.com/p-5...t-kit-for-spo/

You can see how it looks here: https://x3.xbimmers.com/forums/showthread.php?t=1852608

[Burr001]

SS lines came in...Yes they are Blue.

[jrveron]

I found the list of components included in the kit: https://www.getbmwparts.com/oem-part...ed-34112289348

34106880679 1x brake caliper front left
34106880680 1x brake caliper front right
34106887657 1x brake disc front left 395x36mm
34106887658 1x brake disc front right 395x36mm
34106861799 1x brake disc protection plate front left
34106861800 1x brake disc protection plate front right
34106888459 1x brake pads set front
34356890788 1x brake pad wear sensor front
34206884795 1x brake caliper rear left
34206884796 1x brake caliper rear right
34206884797 1x brake carrier rear left
34206884798 1x brake carrier rear right
34206861803 1x brake disc protection plate rear left
34206861804 1x brake disc protection plate rear right
34216867175 1x brake pads set rear
34356890791 1x brake pad wear sensor rear
34216878179 1x brake disc rear left 370x24mm
34216878180 1x brake disc rear right 370x24mm

+ small parts, screws, everything you need for retrofit

(This is from the German website "www_original-autoparts_com/products/34112289348", and for some reason, I can't paste the URL in here.)

I also found the info in: https://www.realoem.com/bmw/enUS/sho...diagId=03_0122

Useful to build your kit or look for parts in a junkyard or similar.

[wlfpck]

Originally Posted by Burr001

SS lines came in...Yes they are Blue.

Team Blue!!!

On my list of things to order as well.

[Burr001]

New paragon rotors, ebc red stuff pads and Goodridge ss lines are on. Brake pedal is firmer a bit touchy at first but I need to bed the pads more.