05-18-2020, 04:47 PM | #23 |
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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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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, 05:50 PM | #26 |
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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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wrong. |
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05-18-2020, 06:27 PM | #29 |
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05-18-2020, 06:32 PM | #30 |
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Partial wear is the pink circle in the pdf.
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05-18-2020, 06:50 PM | #31 | |
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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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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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05-19-2020, 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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05-19-2020, 10:59 AM | #40 | |
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Mike
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2018 M5 and 2019 Porsche Boxster GTS Prior. '94 325is, '97 M3 Lux, '16 M2 |
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05-19-2020, 11:33 AM | #41 | |
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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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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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05-19-2020, 12:25 PM | #44 | |
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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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