M Carbon Ceramic Brakes - Serious Wheel Clearance Issue (rocks / stones)

[Mark's M]

Originally Posted by Mark's M

Agreed, just waiting on the eventual with mine. But that aside, these brakes are fantastic. Notwithstanding their track performance (which for me is 2 days/yr so they're perfect, not too much abuse to warrant wear and replacement worries) the lack of brake dust (and rust after a wash) is worth the price of admission. And yeah, they look really f'n good too lol.

Well 5 days later and the "eventual" happened after only 800km's, right front wheel. Officially a member of this exclusive club now. The rest of what I said above still stands, when I go in for my 2000km break-in service I'll ask what BMW Canada is doing about the issue. I suspect the answer will be "nothing".

[Mario_Kart]

Originally Posted by Mark's M

Well 5 days later and the "eventual" happened after only 800km's, right front wheel. Officially a member of this exclusive club now. The rest of what I said above still stands, when I go in for my 2000km break-in service I'll ask what BMW Canada is doing about the issue. I suspect the answer will be "nothing".

wow that sucks, that didn't take long at all!

[G4BR13L]

Originally Posted by Mark's M

Well 5 days later and the "eventual" happened after only 800km's, right front wheel. Officially a member of this exclusive club now. The rest of what I said above still stands, when I go in for my 2000km break-in service I'll ask what BMW Canada is doing about the issue. I suspect the answer will be "nothing".

What happened exactly in your case because who says this is related? Could be a different problem.

[Mario_Kart]

Originally Posted by G4BR13L

What happened exactly in your case because who says this is related? Could be a different problem.

Are you kidding me? A little pebble got stuck between his wheel and caliper. Did you think he put his finger in there or what?

[G4BR13L]

Originally Posted by Mario_Kart

Are you kidding me? A little pebble got stuck between his wheel and caliper. Did you think he put his finger in there or what?

Where in his reply is he explicitly saying a pebble got stuck? You are making that assumption.

[FirstM3]

Originally Posted by gmarshman

See below--I posted this on another thread. Worth looking into.

Related to unwanted noise: I got a pebble stuck behind the shield on one of my rear wheels and took the car in. The dealer told me that BMW has a new redesign for the shield. They kept the car for two days, installed the new system GIVING ME BRAND NEW REAR HUBS IN THE PROCESS. NB, my hubs were fine--the new hubs are required for the redesign. All under warranty.

Dealer also told me they will not put ANY lube near the CCB system. He says they are aware of unwanted brake squeal but that it is unavoidable with the ceramic rotors and that there is NO FIX.

What exactly did they change? I'm having the same issue again with pebbles getting stuck and having this horrendous screeching noise from the back right tire. I will tell my SA but do you know what exactly they changed, or if you have a part number. Thanks.

[bradleyland]

Originally Posted by PYSpeed.com

OEM M3/M4 Carbon Ceramic Brake Size from Hub Center Point to the farthest edge of the caliper Measurement

Front: 225mm
Rear: 213mm

Here is BC Forged 19inch Monoblock Diagram

Front: 19x9.5 ET25: 235.1mm vs CCB 225mm = 10.1mm clearance
(L means Extreme Deep Concave Profile)



Rear: 19x10.5 ET35: 234.17mm vs CCB 213mm = 21.17mm clearance
(L means Extreme Deep Concave Profile)



I was personally told during our meeting that BC Forged's 19inch Monoblock was specially designed in 2015 to clear up to 400mm disc for the newer car's big brake kit design trends. Hope all these help!

Eric@PYSpeed.com

Brilliant! Thanks so much for posting these.

[CSanto]

Originally Posted by Mark's M

Well 5 days later and the "eventual" happened after only 800km's, right front wheel. Officially a member of this exclusive club now. The rest of what I said above still stands, when I go in for my 2000km break-in service I'll ask what BMW Canada is doing about the issue. I suspect the answer will be "nothing".

I'm very sorry this happened to you.
Your car is gorgeous. It should have NO Flaws!
but welcome to the club. I will say that theres always aftermarket 20s or 19" FI-Rs or BC Forged RZ05 which look awesome!

[j997tt]

Yes, bummer to hear but it was going to happen. I think my first was at less than 1000 miles. I wish I could say it gets better, but it doesn't... Wish you the best.

[Mark's M]

Originally Posted by G4BR13L

Where in his reply is he explicitly saying a pebble got stuck? You are making that assumption.

No, Mario_Kart is right, it was a pebble that did its dirty work and then dislodged itself, just like all the others with CCB's. Absolutely inevitable.

Originally Posted by CSanto

I'm very sorry this happened to you.
Your car is gorgeous. It should have NO Flaws!
but welcome to the club. I will say that theres always aftermarket 20s or 19" FI-Rs or BC Forged RZ05 which look awesome!

Hey CSanto, proud to be a member lol. And thank-you!! At least with the silver wheels it's not that noticeable but I have to admit it jumped right out at me when I walked by it in the driveway yesterday. Then again, anyone with CCB's that knows about this issue will be looking for it...and probably expecting to find it. Oh well.

Even if BMW replaces these wheels (or paints the inner barrel) it's just going to happen again. It's just going to get worse for me when I put on the winter rims which are the black OEM's. Like I said before, BMW needs to reengineer their 19's to properly accommodate the CCB option and then offer to replace them at no cost to the customer. I would LOVE to know how many complaints BMW has received globally about this issue and whether or not there's been any internal discussions on how they're going to address it!!

[G4BR13L]

I am going to pickup mine this weekend or beginning next week and I have also the CCB's but if this happens to me I am not sure that I will be so cool about this as others here.

My car costs a whopping 106,000 euro which is roughly converted 112,700 USD. And for me it is unacceptable to be driving around crowds and being the laughing stock because a f*cking pebble got stuck.

[G4BR13L]

Originally Posted by Mark's M

No, Mario_Kart is right, it was a pebble that did its dirty work and then dislodged itself, just like all the others with CCB's. Absolutely inevitable.



Hey CSanto, proud to be a member lol. And thank-you!! At least with the silver wheels it's not that noticeable but I have to admit it jumped right out at me when I walked by it in the driveway yesterday. Then again, anyone with CCB's that knows about this issue will be looking for it...and probably expecting to find it. Oh well.

Even if BMW replaces these wheels (or paints the inner barrel) it's just going to happen again. It's just going to get worse for me when I put on the winter rims which are the black OEM's. Like I said before, BMW needs to reengineer their 19's to properly accommodate the CCB option and then offer to replace them at no cost to the customer. I would LOVE to know how many complaints BMW has received globally about this issue and whether or not there's been any internal discussions on how they're going to address it!!

The problem is that lot of people complain about this to their dealer but I wonder how many dealers actually report this to BMW. So maybe from the point of view of BMW there is no problem. And maybe for the dealer it is not even a problem because they most probably do not sell many F8x with the CCB's.

But it is NOT normal that 100% of the F8x models with CCB's suffer from this problem and upgrading to other wheels is an option but I am not going to pay for it.

[Mark's M]

Originally Posted by G4BR13L

The problem is that lot of people complain about this to their dealer but I wonder how many dealers actually report this to BMW. So maybe from the point of view of BMW there is no problem. And maybe for the dealer it is not even a problem because they most probably do not sell many F8x with the CCB's.

But it is NOT normal that 100% of the F8x models with CCB's suffer from this problem and upgrading to other wheels is an option but I am not going to pay for it.

Agree wholeheartedly and I think everyone else would too. This is NOT our problem, it's a design/engineering fault. I am going to e-mail Germany and hopefully have the concern directed to the right people. I have confidence that BMW will do the right thing.

[G4BR13L]

This should be a class action lawsuit but I don't know how this works if we are talking about worldwide buyers.

[G4BR13L]

On a side note would replacing the OEM 19" wheels with the HRE P101 wheels solve the problem? Anybody knows if the clearance is increased enough then to solve the problem? Or do I have to sell a 2nd kidney and go for the 20"?

[Mark's M]

Originally Posted by G4BR13L

On a side note would replacing the OEM 19" wheels with the HRE P101 wheels solve the problem? Anybody knows if the clearance is increased enough then to solve the problem? Or do I have to sell a 2nd kidney and go for the 20"?

20's defeat the purpose of our lightweight 19's in combination with the weight reduction offered by the CCB's at each corner. Just doesn't make sense IMO. You and I share the same taste in HRE's lol but I can't afford them either. And yes, I believe HRE has stated their 19" P101's clear the calipers nicely. My e-mail went out a few hours ago so fingers crossed it gets routed to the right people at M Div.

[G4BR13L]

I have now 1200 km I am hearing the sound of two metals rubbing, my guess are bearings, when I drive at low speeds (like stuck in traffic on the highway) and gently turning the steering wheel to change lanes.

I did not hear it before but then again I usually have my music very loud except for yesterday when my wife was sitting next to me.

No squeaking of the CCBs yet thought.

[CSanto]

Originally Posted by Mark's M

Agree wholeheartedly and I think everyone else would too. This is NOT our problem, it's a design/engineering fault. I am going to e-mail Germany and hopefully have the concern directed to the right people. I have confidence that BMW will do the right thing.

Let me know if it goes anywhere. I emailed BMW NA and they called and were like yeah we're really sorry about this, but at the end of the day they wanted me to bring it to the attention of the dealer. Like you said in a previous post, yeah the dealer will replace my wheels, but it will just happen again.

[CSanto]

Originally Posted by G4BR13L

On a side note would replacing the OEM 19" wheels with the HRE P101 wheels solve the problem? Anybody knows if the clearance is increased enough then to solve the problem? Or do I have to sell a 2nd kidney and go for the 20"?

HRE P101 wont fit in 19" but the R101 will, I think you need to go 10" width front though.
The best options for CCB clearance are 19" BBS FI-Rs and BC Forged 19" wheels.
Obviously anything 20" will clear, but it just defeats the purpose of a performance car.

[stuggy]

Wanted to add to this thread even though I don't the ceramics... I have OEM 18's on the steels and I have the same issue with a rock cutting into the inner barrel of the wheel.

[CSanto]

Originally Posted by stuggy

Wanted to add to this thread even though I don't the ceramics... I have OEM 18's on the steels and I have the same issue with a rock cutting into the inner barrel of the wheel.

I've heard of this issue with the 18s. The steels on 19s are fine which is what most people have. Regardless it shouldnt be an issue. This is BMWs first attempt at big brakes though lol.

[absoluteis350]

Sigh.. I suppose I will email BMW NA so that they have a steady stream of these CCB related emails coming in.

Really pisses me off. It happened again this morning on my way to work, and I don't even drive on rocky roads! All it takes is one small pebble and bam, etch your wheel and horrible squeal.