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10-02-2012, 02:03 PM | #1 |
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minimum thickness
im running oem rotors with rs19s right now and my fronts are close to the magic 28.4 minumum thickness. what is the danger of running below that number? my thinking is that if you run well below it say under 27mm and you have worn your pads to a minimum thickness as well you run the risk of the calipers not being able to clap down enough and get a brake failure? by that logic as long as your pads are of significant thickness going under 28.4 wont matter. my rs19s are brand new so almost twice as thick as OEMs. Is what i am saying correct? thanks
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10-02-2012, 02:12 PM | #2 |
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That can happen, but it is my understanding that the minimum thickness is also the point at which the rotor may lose structural integrity. I know on my old E46 the rotors were just in general crummy condition at min thickness. I personally wouldn't run rotors below min thickness long at all, regardless of pad thickness. Your call as to whether to roll the dice.
Sounds like a good excuse for a bbk if you're out of warranty. |
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10-02-2012, 02:50 PM | #3 | |
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10-02-2012, 03:04 PM | #4 | |
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Mine is stock compared to a stripped out track car |
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10-02-2012, 03:14 PM | #5 | |
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10-03-2012, 12:00 AM | #6 |
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I would change them out as they approach the min. thickness of 28.40. Will your rotor suddenly crack at 28.39mm? Probably not, but safety always comes first
I am sure you can find many used rotors for a great price for sale on the market. |
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10-03-2012, 09:28 AM | #7 |
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I might have a set of OEM rotors for sale soon. I'll PM you when I find out.
The biggest issue I see is structural integrity especially with drilled rotors. My experience is that heat cracking becomes more of an issue as the rotors become thinner. Not too bad with slotted but terrible with drilled rotors.
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10-03-2012, 09:34 AM | #8 |
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Okay let me know about your set for sale. On my inspection they don't look cracked yet around the drilled portion and have worn pretty well. Right now they are in the 28.8 range. Didn't check the rears. Just was taking a quick look when switching to new set of ad08s.
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10-03-2012, 10:06 AM | #10 |
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not sure what your supposed to do but i generally shoot for 2mm. that number seems to prevent wear thru of the brake pad indicator.
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10-03-2012, 06:43 PM | #11 |
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Good point, I forgot about that. Worn slotted rotors are less dangerous than worn drilled rotors.
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