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10-30-2008, 09:53 AM | #45 | |
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10-30-2008, 10:07 AM | #46 | |
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10-30-2008, 10:21 AM | #47 | |
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We have raced plenty of stock class BMWs in the past with OEM calipers with racing pads and have never seen this before.
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10-30-2008, 10:31 AM | #48 |
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Track or not....a Brembo caliper or even a bmw caliper should not have that low of design tolerances. Brakes should be the one thing over engineered and robust. Not an area for cost cutting.
However, I do feel more tests are needed to fully understand. 1. We need those with street cars to advise what their caliper pistons look like and at what mileage. 2. We need those with a stock car and stock pads who have tracked their car to advise what their pistons look like and mileage? 3. Also, we need Vin id and build dates of affected cars so as to determine if this issue is widespread or isolated. These facts will help to start building our case. Thanks. |
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10-30-2008, 10:49 AM | #49 |
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I sent an e-mail to Dan Cordes at BMW NA (he either is or at one time was the Performance Parts line manager) to try to see if there is any difference in the components of the calipers.
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10-30-2008, 10:59 AM | #50 |
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Good idea Scott. I also think you might press the issue with your dealer, not from a warranty standpoint, but as a safety issue. Even request a BMWNA field technician take a look at the caliper.
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10-30-2008, 11:10 AM | #51 |
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10-30-2008, 11:13 AM | #52 |
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My concern is that if this a metallurgical flaw in the brake piston design/casting it will eventually show in street-use only vehicles. Just a matter of time.
Where's our handy dandy BMWNA id-person to grab this one and run with it? ; -) |
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10-30-2008, 11:21 AM | #53 | |
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But getting them to replace them with the same parts is going to solve the problem for us anyway. Sure, they are getting hot, but the funny thing is, we're not warping any rotors. So are they really getting that hot?
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10-30-2008, 11:22 AM | #54 | |
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10-30-2008, 11:36 AM | #55 |
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We haven't noticed any problem on the rears, but we'll pull the calipers or look really good in there with a flashlight at the next event in less than 2 weeks (when changing pads on the rears, they slide out the top)
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10-30-2008, 11:38 AM | #56 |
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Andrew, is the car still there and can you take a peek at the rears?
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10-30-2008, 12:16 PM | #57 |
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That's an excellent point about the rotors. Warped rotors are not unusual. But you would expect them to warp long before heat would crack caliber pistons!
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10-30-2008, 12:26 PM | #58 |
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Guys,
Earlier this morning I've already e-mailed this to BMW NA's Accessory Manager and it's been assured to me already that the information has been passed into the correct hands. If I hear any updates, I will inform everyone
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10-30-2008, 12:35 PM | #59 |
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Thanks Dan, you are one stand up guy. Most dealer will shy away to participate into this kind of discussion. I am concern but not too much worry. Thanks.
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10-30-2008, 12:53 PM | #62 |
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Berktech......if one is to go as far as producing titanium backing plates, wouldn't the better solution be alternative caliper pistons from the aftermarket?
Say for example a vendor offered a trade-in program. Send them your calipers and they will send you remanufactured ones with new aftermarket pistons installed? Although, I admit this suggestion is a bit premature since we have not yet isolated if this is a problem facing all 135s or only a small run due to poor production processes with a batch of brembo calipers. |
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10-30-2008, 01:00 PM | #63 | |
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The more I think about it, the more $$$ I may need to sink in the 135i to make it a viable, reliable, long term, trackable package. Perhaps an M3 is better for the long run? :iono:
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10-30-2008, 02:47 PM | #64 |
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I don't think it's an isolated issue. I think it'll happen every single time in the right conditions. I think it's the track pads causing a lot more heat and sustaining that heat is probably causing the damage. Something that BMW did not anticipate I guess. The AutoX guys should be ok as I don't think the short runs will build enough heat to cause damage.
We've run about 6 track days on our OEM brembo caliper. All 6 days were run on the same OEM pad. The brakes were worked pretty hard and for a long period of time, enough to get smoke billowing out the wheels heavily. By the time we took off the OEM caliper and swapped to the Brembo BBK, the pads were falling apart. However, the caliper looked fine. This same OEM caliper was loaned to Scott which apparrently didn't even last 1 event. The logical variable here is the brake pads. I'm pretty sure Scott will figure out a solution quickly. They have no choice, they can't upgrade. |
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10-30-2008, 04:52 PM | #65 | |
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10-30-2008, 05:19 PM | #66 | |
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Titanium backing plates would be cake and are simple enough for the average guy to install. We've even got the perfect test bed to do the testing. :biggrin: Will check our pistons tomorrow and let you guys know. |
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