Premature hairline cracks on rotors?

radiantm3 · 08-12-2012, 11:32 PM

I'm assuming this is normal wear and tear, but just wanted to get a few more opinions on this. I have the Brembo 380 kit and driven maybe 5-7 thousand miles with these and around 3-4 track days. I was cleaning my wheels the other day and noticed small hairline cracks on the face of the rotors (I can't actually feel them when running my fingernails through them). They seem to be only on my front right rotor.

Just seems a bit premature for a 380gt kit + brake cooling. Thoughts?

tlp · 08-12-2012, 11:48 PM

I would say that it's pretty normal but I would keep my eye on it. Good thing that you didn't get drilled rotors. Are you running the OEM supplied Ferodo pads or something else?

radiantm3 · 08-12-2012, 11:54 PM

Quote:

Originally Posted by tlp

I would say that it's pretty normal but I would keep my eye on it. Good thing that you didn't get drilled rotors. Are you running the OEM supplied Ferodo pads or something else?

Yea OEM for now. I have some endless pads on order.

tlp · 08-12-2012, 11:57 PM

I would also send pics of both rotors to Brembo USA to see what they have to say about it. In my the mind the degradation should be the same on both sides.

aus · 08-13-2012, 12:00 AM

For some reason, the right front always get hotter after a track session.
Brembo is on Costa Mesa if you're ever around there.

.

tlp · 08-13-2012, 12:06 AM

Quote:

Originally Posted by aus

Brembo is on Costa Mesa if you're ever around there.

.

They relocated. Race Technologies in Costa Mesa is not the primary supplier anymore.

They are in Plymouth MI and Mooresville NC now.

aus · 08-13-2012, 12:30 AM

That sucks!!

.

klammer · 08-13-2012, 07:23 AM

Looks pretty normal to me. I've got the Alcon super kit and my rotors looked like that as well by the end of the season and were still working fine, just make sure the cracks don't extend to the edges (yes, glad they're not drilled). This is, however, after around 10k mileage and about 22 track days last year. Double check with for piece of mind, but wouldn't sweat it

Gearhead999s · 08-13-2012, 07:30 AM

Quote:

Originally Posted by radiantm3

Yea OEM for now. I have some endless pads on order.

Do you run with your MDM on?If so if your running the same direction most of the time it will brake the inside more to control the oversteer.Otherwise it is normal as others have said and if you are using any of the nannies turn them off to make your brakes life easier.

Porschefile · 08-13-2012, 09:44 AM

Totally normal. You don't have anything to worry about until you can feel the ridges IMO.

radiantm3 · 08-13-2012, 10:29 AM

Thanks for the feedback. I'll just keep an eye on them for now.

Quote:

Originally Posted by Gearhead999s

Do you run with your MDM on?If so if your running the same direction most of the time it will brake the inside more to control the oversteer.Otherwise it is normal as others have said and if you are using any of the nannies turn them off to make your brakes life easier.

I think I drove with MDM on only the first track day with these brakes. DSC OFF ever since!

08-12-2012, 11:32 PM	#1
radiantm3 Apex Everything! 976 Rep 4,378 Posts Drives: 2007 Honda S2000, 2017 GT350 Join Date: Sep 2008 Location: Cedar Park, TX iTrader: (6) Garage List 2011 E92 M3 [9.35] 2014 BMW i3 [10.00]	Premature hairline cracks on rotors? I'm assuming this is normal wear and tear, but just wanted to get a few more opinions on this. I have the Brembo 380 kit and driven maybe 5-7 thousand miles with these and around 3-4 track days. I was cleaning my wheels the other day and noticed small hairline cracks on the face of the rotors (I can't actually feel them when running my fingernails through them). They seem to be only on my front right rotor. Just seems a bit premature for a 380gt kit + brake cooling. Thoughts? __________________ 2011 E92 M3(Sold). 2007 Honda S2000 (Track Car). 2016 Cayman GT4 (Sold). 2017 Shelby GT350 (AKA Crowd Killer). My pet project: https://stickershift.com
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08-12-2012, 11:48 PM	#2
tlp Colonel 276 Rep 2,216 Posts Drives: 991 GT3, Sold:'11 e92 M3 SG/FR Join Date: Jul 2005 Location: Las Vegas/SoCal iTrader: (6) Garage List SOLD 2011 BMW e92 M3 [9.10]	I would say that it's pretty normal but I would keep my eye on it. Good thing that you didn't get drilled rotors. Are you running the OEM supplied Ferodo pads or something else? __________________ 991 GT3, Sold: '11 e92 M3 SG/FR ZCP\|ZCV\|ZP2\|2MK\|494\|415\|6NR\|752
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08-12-2012, 11:57 PM	#4
tlp Colonel 276 Rep 2,216 Posts Drives: 991 GT3, Sold:'11 e92 M3 SG/FR Join Date: Jul 2005 Location: Las Vegas/SoCal iTrader: (6) Garage List SOLD 2011 BMW e92 M3 [9.10]	I would also send pics of both rotors to Brembo USA to see what they have to say about it. In my the mind the degradation should be the same on both sides. __________________ 991 GT3, Sold: '11 e92 M3 SG/FR ZCP\|ZCV\|ZP2\|2MK\|494\|415\|6NR\|752
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08-13-2012, 12:00 AM	#5
aus Major General 890 Rep 9,031 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	For some reason, the right front always get hotter after a track session. Brembo is on Costa Mesa if you're ever around there. . __________________ Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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08-13-2012, 12:30 AM	#7
aus Major General 890 Rep 9,031 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	That sucks!! . __________________ Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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08-13-2012, 07:23 AM	#8
klammer Brigadier General 97 Rep 3,246 Posts Drives: 11 spc gry m3 e90, 19 X5 Join Date: Jan 2010 Location: chicago iTrader: (0)	Looks pretty normal to me. I've got the Alcon super kit and my rotors looked like that as well by the end of the season and were still working fine, just make sure the cracks don't extend to the edges (yes, glad they're not drilled). This is, however, after around 10k mileage and about 22 track days last year. Double check with for piece of mind, but wouldn't sweat it __________________ mods: track ready stuff
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08-13-2012, 09:44 AM	#10
Porschefile Major 59 Rep 1,250 Posts Drives: E92 M3 Join Date: Jul 2008 Location: Tennessee iTrader: (7)	Totally normal. You don't have anything to worry about until you can feel the ridges IMO.
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