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08-28-2008, 12:03 PM | #2 | |
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not sure what you mean by 2 piece setup?? There are 2 ventilated discs per side check here: http://bmwfans.info/original/E92/Cou...4/ill-34_1423/
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08-28-2008, 01:03 PM | #3 |
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They are a two piece design. An aluminum hat with the disk connected by pins that allow for thermal expansion while reducing heat transfer to the hub.
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08-28-2008, 10:13 PM | #5 |
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2 piece rotors are supposedly more resistant to warping, not less. Although they don't transfer as much heat to the hub the design is allow the disc material to expand independently from the carrier. What most diagnose as a warped disc is usually uneven pad material transfer due to pads exceeding their temperature range or incorrect bedding-in procedure. I've done this myself a few times.
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08-28-2008, 10:41 PM | #6 |
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Are you absolutely sure you have warped rotors? They should not warp that easily. My brakes develop a slight vibration toward the end of the track day, but it goes away after a couple of weeks of driving, which makes me think the issue has to with the pads or something else. This has happened to me twice now.
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08-28-2008, 10:52 PM | #7 | |
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08-28-2008, 11:03 PM | #8 | |
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edit: Not a brake expert, but unless your pulling up your hand brake after some hotlaps or really really pushing them hard find it hard to believe that they warped.
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08-29-2008, 12:56 AM | #9 |
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I'm sure they gotta be a bit suspicious if you come in for this service every 4000 miles. I wonder what the limit is...
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08-29-2008, 07:58 AM | #10 |
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They won't keep on replacing your rotors at 5000 miles intervals. They would most likely do it once at that rate. Over the 4 years, it is not uncommon to get 3 or so replacements.
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08-29-2008, 10:52 AM | #11 |
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Please tell me that you don't use your E-brake when you park your car after lapping sessions. I assume that you don't, but I have seen it too many times.
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08-29-2008, 11:08 AM | #12 | ||
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nope
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08-29-2008, 12:35 PM | #13 | |
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The rotors can be glazed due to overheating of local areas, which changes the characteristic of the metal and causes uneven friction across the surface of the rotor, which results in vibration. The first time that happened to me, it went away after a few weeks of driving as I mentioned, but it might very well not, in which case you need to replace the rotor.
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08-29-2008, 12:46 PM | #14 | |
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08-30-2008, 02:29 AM | #16 |
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they are two piece floating roters with an aluminum hub hat and an iron disk, they replace the entire disc unit at one time.
however a lot of vibrations from the track are not always due to warping but due to brake pad material melting to the rotor. if so it will wear off and go away after a few thou miles, the only way to tell is to but the brake rotors on a lathe. two pc. rotors should resist warping better than a one peice rotor (a single pieceof iron, hub and disc. )
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08-30-2008, 10:23 PM | #17 |
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These issues sound pad related...wrongpads for the track. Ive had the material buildup on the rotor issue on other cars and they always went back to normal after a week of normal driving, although I left the race-pads on until they cleared the rotors.
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08-31-2008, 02:51 PM | #18 |
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