Big Brake Upgrades via the BMW G series catalog

[MisterSkiz]

Maybe read this thread that literally explains it all?

But how did you drill the holes in your firewall?

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[Maki2282]

Maybe read this thread that literally explains it all?

I've been reading it, but maybe I missed something. I'm reading it all through a translator. I'm from Spain, so it might not have been translated correctly. If you could send it to me, I'd appreciate it. Or you could mention the message. Thanks.

 

[Daxxr]

Shit like this is never simple, and if youre the first person to do it, its even worse!

Good news is fronts fit great. We will see how the new rear rotors fit when they arrive and if I can get the adapters so I can use the full M rotors laters.

Edit - Since the 26.7mm difference is 1.05", I wonder if two 1" spacers would work, or if thats a stupid idea...

Edit 2 - Someone tell me if this is a horrible idea - https://www.amazon.com/Aluminum-Unt...ng-Spacers/dp/B09TY65KCM?ref_=ast_sto_dp&th=1

I made mine exactly 27mm, this put the caliper perfectly inline with the G8* OEM brake disc

 

[DarkZupra]

I made mine exactly 27mm, this put the caliper perfectly inline with the G8* OEM brake disc

Did you CNC your own adapters?

 

[Daxxr]

Did you CNC your own adapters?

I purchased a spare rear hub assembly and used that to create the rear spacers. Just a simple milling machine in my workshop, no cnc.
I have a BMW G42 with Supra wheels fitted, so this thread has been very helpful, especially with the front caliper clearance.
I am returning that help with sharing any info that I can.

 

[DarkZupra]

I purchased a spare rear hub assembly and used that to create the rear spacers. Just a simple milling machine in my workshop, no cnc.
I have a BMW G42 with Supra wheels fitted, so this thread has been very helpful, especially with the front caliper clearance.
I am returning that help with sharing any info that I can.

Got any pics of the adapters you made?

In other news, a 1" spacer works but is WAY too sketchy, so a proper spacer would be needed to use G8x rotors:

Also the G30 M550i LCI rotors work:

Just waiting on the X3M rotors to arrive. If those fit, ill return the G30 rotors and just use those.

 

[S2gizzle]

Shit like this is never simple, and if youre the first person to do it, its even worse!

Good news is fronts fit great. We will see how the new rear rotors fit when they arrive and if I can get the adapters so I can use the full M rotors laters.

Edit - Since the 26.7mm difference is 1.05", I wonder if two 1" spacers would work, or if thats a stupid idea...

Edit 2 - Someone tell me if this is a horrible idea - https://www.amazon.com/Aluminum-Unt...ng-Spacers/dp/B09TY65KCM?ref_=ast_sto_dp&th=1

I am happy that the fronts are working well for you

 

[razorlab]

Also the G30 M550i LCI rotors work:

Just waiting on the X3M rotors to arrive. If those fit, ill return the G30 rotors and just use those.

So is that the 370mm rotor with G8X calipers? (and M performance package M550i rear calipers)

 

[DarkZupra]

So is that the 370mm rotor with G8X calipers? (and M performance package M550i rear calipers)

370mm x 24mm M550i LCI rear rotor, G8x Caliper. The rear rotor on the M550 went from 345 to 370 when they did the LCI refresh. The X3M rotors should be here tomorrow.

 

[razorlab]

370mm x 24mm M550i LCI rear rotor, G8x Caliper. The rear rotor on the M550 went from 345 to 370 when they did the LCI refresh.

I believe the rear caliper is the same for all the 370mm rotors. So not just G8X.

So with the M550i LCI, they went from 374mm front / 345mm rear to 374mm front / 370 mm rear?

Because the optional M performance package on the M550i is 395mm front / 370mm rear. (X3M/X4M setup) Just wondering/curious if they upped to the 370mm rear with the normal 374mm front now.

 

[DarkZupra]

I believe the rear caliper is the same for all the 370mm rotors. So not just G8X.

So with the M550i LCI, they went from 374mm front / 345mm rear to 374mm front / 370 mm rear?

Because the optional M performance package on the M550i is 395mm front / 370mm rear. (X3M/X4M setup) Just wondering/curious if they upped to the 370mm rear with the normal 374mm front now.

Im not super sure about the front, only because I wasnt researching it but yes, the G30 LCI uses a 370mm rear, even without the M-Performance pack. The X3M/X4M uses the same rotors dimensionally, but they are the aluminum hat version similar to the G8x.

And yeah the caliper is used on a ton of cars.

 

[razorlab]

The X3M/X4M uses the same rotors dimensionally, but they are the aluminum hat version similar to the G8x.

They are all aluminum hat rotors on BMW. You mean the "floating" M style right, not the pressed aluminum hat.

 

[DarkZupra]

They are all aluminum hat rotors on BMW. You mean the "floating" M style right, not the pressed aluminum hat.

Precisely.

 

[rwense]

I appreciate all of the research and trial/error testing you guys are going through. Makes me have faith in humanity again

 

[DarkZupra]

OK - X3M rotors fit for the rear. In case these look weird, its because theyre cheaper full cast repalcements, instead of the OEM floating aluminum hat ones. It was easier to spend another $200 on cheap ones than $600 for OEM when i wasnt sure if they would fit.

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