Are my Rotors Toast?

aus · 12-17-2021, 12:01 AM

Only been about 1.5 years and maybe 10 track days using Stoptech SR32 and SR34 pads.
I always do a cool down when I can and then drop around the paddock for 4-5 min.

Estoril Blue · 12-17-2021, 12:07 AM

If you can catch a fingernail in the cracks, then its time to replace them.

patroklai · 12-17-2021, 12:13 AM

Looks toast

roastbeef · 12-17-2021, 05:40 AM

Those are about spent. Any vibration?

tdott · 12-17-2021, 07:36 AM

Yes.

dparm · 12-17-2021, 08:27 AM

Replace before next track day. The cracks coming off the holes like that are the red flag.

aus · 12-18-2021, 01:38 AM

I can't catch a nail but seem some going from hole to hole.
No vibration or issues at all but don't look great.
.

Estoril Blue · 12-18-2021, 11:15 AM

Drilled rotors will always be more susceptible to this problem. Track rotors should be blanks, dimpled or slotted.

aus · 12-20-2021, 12:18 AM

Agreed. Slotted next time.
How do you know when slotted rotors are done?
.

StripclubDJ · 12-20-2021, 12:46 AM

10 more days left

dparm · 12-20-2021, 06:43 PM

Quote:

Originally Posted by aus

Agreed. Slotted next time.
How do you know when slotted rotors are done?
.

Same rules as any other rotor. Large cracks you can catch your nail on, or cracks that extend all the way to the inner or outer edges. Cracks coming off the slots are less of an issue but shouldn't be completely ignored.

aus · 12-21-2021, 12:18 AM

Quote:

Originally Posted by StripclubDJ

10 more days left

I have no concerns about street driving but track driving using track pads...

admranger · 12-31-2021, 11:02 AM

Have I not taught you guys anything? When in doubt, float test those rotors!

Hint: they are done -- the crack coming off the holes is the red flag.

12-17-2021, 12:01 AM	#1
aus Major General 892 Rep 9,032 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	Are my Rotors Toast? Only been about 1.5 years and maybe 10 track days using Stoptech SR32 and SR34 pads. I always do a cool down when I can and then drop around the paddock for 4-5 min. Attached Images __________________ 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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12-17-2021, 12:07 AM	#2
Estoril Blue First Lieutenant 75 Rep 387 Posts Drives: 2006 M3 Join Date: Dec 2006 Location: Maryland iTrader: (0)	If you can catch a fingernail in the cracks, then its time to replace them.
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12-17-2021, 12:13 AM	#3
patroklai Major 222 Rep 1,254 Posts Drives: Camaro SS \| e92 M3 Join Date: Jul 2011 Location: STL iTrader: (10)	Looks toast
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12-17-2021, 05:40 AM	#4
roastbeef Lieutenant General 11586 Rep 12,728 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	Those are about spent. Any vibration? __________________ Instagram; @roastbeefmike
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12-17-2021, 07:36 AM	#5
tdott Brigadier General 3949 Rep 3,988 Posts Drives: M3 Join Date: Nov 2010 Location: South FL / 6ix iTrader: (4)	Yes. __________________ N/A S65 Headers Before/After Dyno Results
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12-17-2021, 08:27 AM	#6
dparm Stop the hate, get a V8 3851 Rep 8,625 Posts Drives: C7 Corvette GS, AMG C63 S Join Date: Jun 2013 Location: Frisco, TX iTrader: (1)	Replace before next track day. The cracks coming off the holes like that are the red flag. __________________ Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan Past: 2011.5 M3 sedan ZCP
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12-18-2021, 01:38 AM	#7
aus Major General 892 Rep 9,032 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	I can't catch a nail but seem some going from hole to hole. No vibration or issues at all but don't look great. . __________________ 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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12-18-2021, 11:15 AM	#8
Estoril Blue First Lieutenant 75 Rep 387 Posts Drives: 2006 M3 Join Date: Dec 2006 Location: Maryland iTrader: (0)	Drilled rotors will always be more susceptible to this problem. Track rotors should be blanks, dimpled or slotted.
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12-20-2021, 12:18 AM	#9
aus Major General 892 Rep 9,032 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	Agreed. Slotted next time. How do you know when slotted rotors are done? . __________________ 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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12-20-2021, 12:46 AM	#10
StripclubDJ Lieutenant Colonel 4100 Rep 1,612 Posts Drives: e92 m3 Join Date: May 2016 Location: calis iTrader: (2)	10 more days left
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12-31-2021, 11:02 AM	#13
admranger Retired Curmudgeon 2985 Rep 4,047 Posts Drives: ‘19 X3M40i, ‘18 m550i Join Date: May 2011 Location: Las Vegas, NV iTrader: (1)	Have I not taught you guys anything? When in doubt, float test those rotors! Hint: they are done -- the crack coming off the holes is the red flag. __________________ '19 X3 M40 Carbon Black/Oyster, '23 Jeep Grand Cherokee L Summit, Past BMWs: '18 M550i, '18 330 GT, '16 X5 40e, '11 E90M3, '06 X5 4.4, '03 330i ZHP, '02 M3, '97 Z3 2.8, '95 M3 (2x), '94 530i (manual), '92 525i (manual), '88 M3, '87 325iS
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