09-20-2016, 04:05 PM | #23 |
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Sure... What else ya got!
(I do realize there is an iron brake conversion from Racing Brake...)
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09-20-2016, 04:40 PM | #24 | |
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The M5/M6 is 100g Front (410mmx38mm), 70g Rear (396mmx26mm) What I cannot find anywhere, including TIS, is a data sheet for M3/M4 400x38-380x28 for their specific limits. It should be similar in the front and slightly more for the rear though. |
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09-20-2016, 04:49 PM | #25 | |
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I've sent a note to my advisor to see if he can find the correct associated numbers for the M3/M4. My representative front rotor is still 141 grams above the 7215 min weight stamped value (7356 g). My representative rear rotor is still 68 grams above the 5734 min weight stamped value (5802 g). So, I'm not sure how I could still be 141 grams above a value where there should only have been 100 grams to begin with...
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09-20-2016, 05:58 PM | #26 | |
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09-21-2016, 11:46 AM | #29 | |
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09-21-2016, 11:59 AM | #30 |
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To do it properly takes time. The video above specifically addresses these issues in fact. With maximum loss limits of 2.5oz - 3.5oz, accuracy of process is an understatement.
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09-21-2016, 03:26 PM | #31 |
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09-25-2016, 02:31 AM | #33 |
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Agreed but even with a significant discount, pads and rotors alone are $13k plus labor. What's really hard to fathom is the retrofit package, with calipers and all additional hardware included, is discounted below the cost of the consumables.
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09-25-2016, 03:43 AM | #34 | |
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09-26-2016, 09:23 AM | #35 |
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Might as well buy that kit every time the rotors need to be replaced. Like this you get inclusive new calipers (with new seals)
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09-26-2016, 11:30 AM | #36 |
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I just got back from the SCCA Nationals in Mid-Ohio.
I decided just to do the Front Rotors - but do pads all around. I also asked my shop to carefully save me the front rotors in the event that further investigation leads me to believe there is usable life left in them. My shop is going to weigh the NEW front rotors and then give me their specific weights as well as the min weight stamped on each rotor. This should be sufficient to confirm BMW is simply using an allowable loss value for each rotor - and to identify what that value is. Once I know what the allowable loss is (in grams) it will be much easier to determine how worn a rotor actually is: ( (Actual Weight - Min Weight) / (New Weight - Min Weight) ) * 100 = Percent Life Remaining As I'm not getting my rear rotors replaced, I've reached out to a couple of friends at the BMW PDC in Spartanburg to see if they have a couple of new rear CCB rotors on the shelf for their M3/M4 fleet. I've also asked them for the new weight of a couple of rear rotors as well as the stamped minimum weight on each. This should give us the numbers we need for a similar calculation on the rear rotors. The unfortunate part is that I'm not yet at the min weight of ANY of my rotors (despite what the wear indicators say). If I wasn't using this car on the track, I would not replace anything yet. However, with a track car, since I'm doing pads all around, it would be wise to also do the rotors if I'm getting "close". The unfortunate part is we do not have enough info (yet) to determine what "CLOSE" actually is... But I'm working on that...
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09-26-2016, 05:17 PM | #37 |
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I just got the following info back from my shop ($10K for front rotors and pads front/rear):
New Rotor Info (Weight New - Min Weight = Usable Weight): LF: 7356g - 7165g = 191g RF: 7294g - 7096g = 198g So it looks like there is about 200 grams of meat (usable weight) on each of the front rotors... Here is the data from my front rotors which were removed: LF: 7350g - 7215g = 135g // 135/200 = 67.5% remaining! RF: 7363g - 7224g = 139g // 139/200 = 69.5% remaining So, now I need to find out if my rotors were REALLY done. The wear indicators seemed to indicate this, but the weight reduction says I have 2/3 of their life left. Short of buying a Carboteq instrument ($6500), there ought to be a better way. We are still researching this... I'm also still waiting for New/Min weights from an unused set of REAR rotors for comparison...
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09-26-2016, 05:45 PM | #38 | |
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Will BMW cover the pads and rotors under warranty?
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09-26-2016, 07:35 PM | #39 | |
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09-26-2016, 08:40 PM | #40 |
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Wow I feel your pain!! This is stuff I didn't even know about. So glad I passed on the CCBs especially that I wouldn't have put them to real use as I don't see myself tracking the car at all (well....maybe once or twice in its life time at best)
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09-27-2016, 11:15 AM | #41 |
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Nope... Not for CCB's and I expect not if you track your car in any case...
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09-27-2016, 11:19 AM | #42 |
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Umm... By weighing them?
The new rotors were weighed before they were installed. My old/used rotors were weighed after they were removed. Still waiting for the weights of a couple of new REAR rotors so I can establish a similar baseline. I have the weight of one, but I'm waiting for a second to ensure the numbers are relatively close. I'll post this info as soon as I get it.
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09-27-2016, 11:22 AM | #43 | |
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Although the CCB's work real well for track use, their best investment may actually be for STREET use. They last forever on the street, still work exceptionally well, and don't produce any brake dust. Its ironic, but the high replacement cost of CCB's is only a factor if you actually track your car. If you're running you car on the street, you get all the benefits and likely won't ever have to replace them.
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09-27-2016, 01:45 PM | #44 | |
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if you leased, doesn't make sense to me. If you bought it and plan to track yes. Regardless, it's facking expensive. |
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