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10-02-2008, 10:51 PM | #45 |
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I just got my carbotech pads, their medium compound. They are supposed to have similar friction to stock pads when cold, and obviously much higher when hot. The guy I spoke with at carbotech says they aren't that noisy on the street (not like the RS19s), and dust should be comparable to stock. They obviously will not have as much bite as their racing compounds or the RS19s, but it is a good compromise for me at the time. He assured me that they would not melt onto the rotors at the track like stock pads do. I'll put them on tomorrow, and try them out on the track this weekend. I'll find out if the sales rep was telling the truth and nothing but the truth...
Having said that, there is no excuse for shipping an M car with fluid that boils and splashes around the engine bay after a session. I bet the humming noise the OP is referring to indeed had something to do with stock pads. I get that as well occasionally along with vibration after track days. It goes away after 3-4 weeks of normal driving. I wouldn't have too much faith in your dealer diagnosing that. When I took mine in for the vibration, they had no idea what was going on. They wanted to sell me new tires, and I was like, "you've gotta to be kidding me man, it's the brakes can't you see!" and they kept on saying there was nothing wrong with the brakes. If the pads, together with the fluid flush that was done a couple of months ago, solve my problems, then the total upgrade cost is around ~$500. If they don't, then I'll be pretty pissed as I should not have to pay $7k to have brakes that will hold up during a HPDE day on this car.
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10-02-2008, 11:01 PM | #46 | |
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There's nothing wrong with the M3 brakes that a change of pads and fluid doesn't solve. They are amazingly effective, even on the track. I don't need to pay $2000 for a prettier looking brake when I can solve the M3 brake issues with pads and fluid. The only other addition I might make is some brake ducts, which again will be significantly less than $2000.
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10-04-2008, 08:01 PM | #47 |
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The carbotech pads were a HUGE success at the track today. The vibration during braking, which used to persist for weeks even after the track day, is gone, and bite is significantly increased. I'll post the details later.
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10-06-2008, 03:24 AM | #48 |
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Looking forward to it. Can you also post details on where we can purchase these pads from and were you able to confirm that the pads are not noisy during daily driving?
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10-06-2008, 11:04 AM | #49 | |
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http://www.ctbrakes.com/pads/bmw.html I went for the medium compound, XP8, which is supposed to be streetable. I will keep them on the 17th--my last track event of the year. So far they are fine on the street. No issues with cold temp grip. However, they are somewhat noisy right before you come to a stop, so I'll take them out for the winter. With the BMW CAA discount, they are about ~$350 for the 4 corners. A small thing: the bonding agent overflowed into the pad sensor space, and it wasn't possible to insert/use the sensors. Inconsequential if you won't run them all the time, but a minor quality control issue nevertheless.
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11-29-2008, 07:43 AM | #50 | |
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Thanks again.
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11-30-2008, 02:45 PM | #52 | |
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The problem has been putting the stock pads back. I kept the XP8s for about 3 weeks on the car without any issues (no vibration or lack of cold grip), and ended up eating through the fronts after about 5 track hours. Completely gone. I put the stock pads back on, and now there is vibration when braking. I was hoping it would go away with time, but it's been almost 7 weeks. Probably has to do with the pad material deposited on the discs not matching the material on the current pads. Annoying...
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11-30-2008, 03:55 PM | #53 | |
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Good brake pads fluid and some SS lines goes a long way. Going to the track with street pads = serious FAIL!!! You'll probably run out of tire grip before you have brake issues (track compound pads)...
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11-30-2008, 04:01 PM | #54 | |
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I usually do the 100mph to thresh hold braking x 3 and let them cool for 15 and then do it again, and it always works for me.. Those pads might work differently though.
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12-01-2008, 01:14 PM | #55 | |
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Run her up to a hundred, induce full ABS stop, three-four times, clean as a whistle. |
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12-01-2008, 08:07 PM | #56 |
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I don't know about ABS stops. Bed-in procedures are pad specific as far as I know. I did 8 70-20 steep but not at the limit decelerations when I bought the car. Good idea to try it again though. Thanks.
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03-30-2009, 11:51 AM | #58 |
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I already moved to the RS19s.
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03-30-2009, 05:39 PM | #60 |
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Hi Guys,
Read all the posts and I am more confused than before. Facts: 2008, E92M3, 10,000 miles, 50% track use, since last fast tracks, evident vibration on front (left mainly) while breaking, some blue and irregular lines on front discs, bite is normal or better (?): my conclusion was wrapped discs. 1, reading the posts, could it be irregular pads depot on the discs? 2, Was thinking about moving to ap racing, but it seems they are basic products from the very good company. It seems also that 6 pistons is not better than what I have. 3, Is it reasonnable to think that RS19 and brake fluid will be the best $€/efficacy move? Thanks |
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03-30-2009, 06:50 PM | #61 | |
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Yes, doing those 2 things alone will result in a drastic improvement.
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03-31-2009, 12:03 AM | #62 | |
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Car was stock. The "problem" is that I went to the dealer yesterday and they suggested to change discs and pads under warranty, still explaining between the lines that one time was Ok but if I come back every year with this they won't assume brake change as part of the normal use of my car under full coverage. My point is more that I don't want to spill my chance but changing the discs if it is not necessary. If it is depots of pads, after how many miles should it be cleared? Last edited by bher; 03-31-2009 at 12:04 AM.. Reason: mispelling |
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03-31-2009, 01:57 AM | #63 | |
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would have disappeared. You should mount for Pagid Racing RS19 for the track day. |
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03-31-2009, 07:25 AM | #65 |
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It can take some time. 4-8 weeks in my experience. It happened to me once, and I never ran with stock pads on the track after that. The dealer was pretty clueless about the problem. They told me I needed a new set of tires, and I told them it wasn't the tires. Interesting how everybody wants to sell you tires the first chance they get. Anyway, a pad manufacturer suggested sanding the surface of the rotors with an orbital sander to get rid of the uneven deposits, but I didn't try that. Another approach would be to mount the RS19s and let them remove the stock deposits. Also, are you sure you didn't use your hand brake after your session on the track? That can warp your rotors indeed.
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03-31-2009, 10:01 AM | #66 | |
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http://www.realoem.com/bmw/showparts...85&hg=34&fg=30 I guess I'm wondering if it's possible to warp the front rotors with the parking brake and if even the rear rotors are impacted by them? Having said that, I never use my hand brake at the track because I'd rather not for no reason than warp my rotors. |
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