11-21-2014, 09:59 AM | #1 |
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Carbon Ceramics @ the Track
I'm curious if anyone with carbon ceramics has tracked or is planning to track their car?
I know the rotors are prohibitively expensive to replace but I would think that steel replacements might become available by the time you wear the stock-carbons out. Then I'm also curious how much faster they will wear out with light track use 3-4 times per year. |
11-21-2014, 10:23 AM | #2 |
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M5 rear steel rotors should fit the fronts as replacement, and M3/4 front steels would be replacements for the rear ceramics
Also this topic is covered somewhat here: http://f80.bimmerpost.com/forums/sho....php?t=1047585 |
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11-21-2014, 10:49 AM | #3 | |
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Also, I didn't realize that the master cylinder and brake booster were upgraded in addition to the calipers and correspondingly increased rotor sizes, another nice benefit from checking this option. |
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11-21-2014, 12:02 PM | #4 | |
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In terms of longevity on the track, my personal expectation is twice the life of steels. And if actually BMW honors free replacements as part of maintenance, even only once, the price they charge for the CCBs are justified for me. If they don't replace them, then I'll go with steel replacements. |
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11-21-2014, 01:39 PM | #5 | ||
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Should you change to steel rotors the pad/disc size and piston advantages will still be present over stock brakes, with the added disadvantage of increased rotating mass over even the standard M-compound braking set up. The advantage of the increased friction coefficient will be lost and although it will still be possible to exert sufficient force to lock wheels, due to the reduced mechanical advantage provided by the brake booster additional force will be required at the pedal. How this would feel as compared to the stock steel set up I am unsure (less booster but more rotor/pad) but compared to the CCB set up this would feel significantly softer. |
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11-21-2014, 04:18 PM | #7 |
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If you really mean light track useage and if you do not allow the pads to get more than 2/3rds worn before replacement, I think you will see far greater life of the CCB rotors than twice that of the steels.
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11-21-2014, 08:12 PM | #8 |
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I am not sure what light track usage means. Is it # of days or driving non-agressively while on it? I do about 6-8 events a year, that's 16 to 24 days, but I am a light braker in general.
Also why change of pads so early be a good idea, how does it relate to the rotor's usage? TIA. |
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11-22-2014, 10:42 AM | #9 |
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I can't find the link now, but there is something related to how the CCM materials are layered that causes the wear to accelerate significantly once the pads are beyond 50%. From what I remember, this is a pretty important factor, but I'd guess that most people will ignore it and bitch that their CCB's are trashed after 2 track days.
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11-22-2014, 10:46 AM | #10 | |
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The same is seen on standard iron rotors, the more the pads are worn, the more sensitive a brake system is to fade and the faster the pads wear. |
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11-22-2014, 10:47 AM | #11 | |
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A "non-aggressive" HPDE driver would be someone who is perhaps in the intermediate group and is a 'light' braker IMHO. Bish |
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11-22-2014, 10:54 AM | #12 |
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As a tidbit, I usually find that the intermediate/advanced students are the ones that are the toughest on their brakes. They have gained sufficient confidence to become decently quick, but tend to overbrake every corner .
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11-22-2014, 04:21 PM | #13 |
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Well you're probably correct as I've been a not too aggressive braker in the advanced group for over 20 years. Hence its been a while since I was in the other groups.
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11-22-2014, 07:37 PM | #14 | ||
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I agree as my experience has been similar. |
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