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BMW M5 F90 (2018+) General Forums Wheels | Tires | Suspension | Brakes | Chassis    Cracked Ceramic Break Rotor **HELP NEEDED**

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      05-18-2020, 04:47 PM   #23
TheRealBob
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Quote:
Originally Posted by onfireX5 View Post
This has not even removed the top coat yet to start delamination and should be fine to drive.....if it had not "chunked" elsewhere,,,

Unless that wear is deeper than the pic. If it’s into the rotor, then yep, they are used up.
I hope for KBM5's sake you're right. Replacing these would be an expensive proposition.
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      05-18-2020, 05:29 PM   #24
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Quote:
Originally Posted by TheRealBob View Post
The wear indicator on the rotor clearly indicates heavy usage. It would very much surprise me to see BMW replace this for free. In fact, if the other rotors are equally as worn, they will need replacement as well.

Technical information on CCB's - https://documentcloud.adobe.com/link...2b10&pageNum=1
I don't think his wear indicators are nearly to the point of needing replacement, according to the document you posted. I agree they don't look brand new, but weight should factor into the decision here as well.

It is also hard to conceive that he could be near the end of his disc service life given milage and one track event. Speaking with the instructors when I did M School in Spartanburg, all the M5s had CCBs, and asking how well they hold up, they said substantially longer than steel with everyone beating the hell out of them. Unless the OP tracked it a lot more than he's saying, there's no way he already wore them out.

Last edited by Demon Barber; 05-18-2020 at 06:17 PM..
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      05-18-2020, 05:41 PM   #25
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wow, didn't even notice the wear indicator was worn on OP's pic..


looks like someone had more than "one' trackday..
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      05-18-2020, 05:50 PM   #26
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Quote:
Originally Posted by onfireX5 View Post
If this is partial wear.....and ok to run....

I think you have this backwards. Your picture up top is full wear. The original post shows the “circle” which means not worn. As wear increases the circle disappears. The PDF how’s a picture of a rotor with the full wear circle as “new”
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      05-18-2020, 06:23 PM   #27
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That first pic sure looks to me like something got stuck between the rotor and the pad. Look at the scrape moving outward from the missing area. My guess is that a rock kicked up and damaged the rotor and the debris got dragged between the pad and the rotor. Even if all of the car's miles were track days, CCBs should not be worn out that fast.
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      05-18-2020, 06:26 PM   #28
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Quote:
Originally Posted by Archimedes65 View Post
That first pic sure looks to me like something got stuck between the rotor and the pad. Look at the scrape moving outward from the missing area. My guess is that a rock kicked up and damaged the rotor and the debris got dragged between the pad and the rotor. Even if all of the car's miles were track days, CCBs should not be worn out that fast.


wrong.
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      05-18-2020, 06:27 PM   #29
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Quote:
Originally Posted by TrevorM3 View Post
wrong.
Then BMW puts some shitty CCBs on their cars, because the Gen III PCCBs Porsche puts on their cars will do that many track miles without blinking, and in street use will easily turn 100,000 miles.
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      05-18-2020, 06:32 PM   #30
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Quote:
Originally Posted by AllForTheCash View Post
I think you have this backwards. Your picture up top is full wear. The original post shows the “circle” which means not worn. As wear increases the circle disappears. The PDF how’s a picture of a rotor with the full wear circle as “new”
Partial wear is the pink circle in the pdf.
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      05-18-2020, 06:50 PM   #31
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Quote:
Originally Posted by Archimedes65 View Post
Then BMW puts some shitty CCBs on their cars, because the Gen III PCCBs Porsche puts on their cars will do that many track miles without blinking, and in street use will easily turn 100,000 miles.


most people don't even track with CCB because of replacement cost.


anyway, i highly suspect OP has had more track days than he is letting on. wear indicator is down.

i've literally never seen that happen to a ccb rotor.
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      05-18-2020, 07:58 PM   #32
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Here's a pic of one of my front rotors with 30k kilometers and 0 track days. Maybe the OP had a particularly brutal day at the track to explain the wear sensors, but as far as the missing chunk goes, that shouldn't happen with part of the wear sensors intact. I say premature failure.
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      05-18-2020, 07:58 PM   #33
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Quote:
Originally Posted by Archimedes65 View Post
Then BMW puts some shitty CCBs on their cars, because the Gen III PCCBs Porsche puts on their cars will do that many track miles without blinking, and in street use will easily turn 100,000 miles.
Most people go bbk I rarely see people using ccbs on a track day.
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      05-18-2020, 08:07 PM   #34
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Don't know if there's any difference, but that attached PDF was from 2012. If the F90 is using a new generation of materials (not claiming that they are), the info could conceivably be outdated. Although, I would say the current F90 CCB rotors appear awfully similar to the F10s. Would be helpful if anyone has access to current gen guides.
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      05-18-2020, 08:28 PM   #35
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Great info all around in here.
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      05-19-2020, 07:35 AM   #36
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I am glad to not have the carbon fiber brakes.

Mike
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      05-19-2020, 10:25 AM   #37
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I had an appointment with my SA today.

I took advantage to have my brakes checked.
The workshop chief said that rotors and brake pads are absolutely new (my car has 32K km and has never been tracked).

He checked the round indicator and the pads : NEW.

I learned something interesting today : the best way to know if your rotors are still in a good shape, you need to take them apart and weigh them!
This is only done on high mileage cars, or cars that are often tracked.

I spoke to him about your problem, and he said that there are 2 options :

-your car was tracked more than once, or very heavily if only once
-you used acid products to clean your wheels

Last edited by Alberta; 05-19-2020 at 10:45 AM..
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      05-19-2020, 10:31 AM   #38
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Originally Posted by Aronis View Post
I am glad to not have the carbon fiber brakes.

Mike
I'm so happy to have them...

The color is beautiful and the power of braking is insane!
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      05-19-2020, 10:52 AM   #39
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Originally Posted by Can-am View Post
I'm so happy to have them...

The color is beautiful and the power of braking is insane!
I have them on my 20 M5C and love them. The brakes on my F85 were horrible!! I don't think I can go back to non CCB on a BMW ever again!
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      05-19-2020, 10:59 AM   #40
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Originally Posted by Can-am View Post
I'm so happy to have them...

The color is beautiful and the power of braking is insane!
I agree the cosmetic appearance is nice, but I prefer the blue. I have no issues with the stopping power of the standard old fashioned metal rotors, but the brake dust is a different animal. LOL.

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      05-19-2020, 11:33 AM   #41
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Originally Posted by GhostOne_322 View Post
I have them on my 20 M5C and love them. The brakes on my F85 were horrible!! I don't think I can go back to non CCB on a BMW ever again!
Same for me, I'm also coming from an F85 X5M.
The brakes were good, but noisy like a school bus ...

The CCB's are quiet and so powerful
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      05-19-2020, 11:36 AM   #42
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Originally Posted by Aronis View Post
I agree the cosmetic appearance is nice, but I prefer the blue. I have no issues with the stopping power of the standard old fashioned metal rotors, but the brake dust is a different animal. LOL.

Mike
I'm not saying that the "regular steel brakes" are bad.
I test drove one without CCB's, but man there's a huge difference!

Speaking about brake dust, none with CCB's
It was a nightmare to keep the wheels clean on my X5M.
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      05-19-2020, 11:44 AM   #43
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I think this sums it up.

https://www.autoblog.com/2019/03/24/...r-race-tracks/
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      05-19-2020, 12:25 PM   #44
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Originally Posted by TheRealBob View Post
I'm very surprised.

The guy to who I spoke today told me that BMW has made a test on the Nurburgring with regular steel brakes on the M5 F90, and after 3 laps done by a professional driver, the brakes were dead.

They did the same test with the CCB's, and they lasted way over 10 times more than the steel brakes.

I do not entend to track my car, so anyway it doesn't matter much to me, ì'm just enjoying a very performant and silent brake system.
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