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Old 05-02-2014, 03:43 AM   #1
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Default cracking rotors

Using sports rotors at the rear. My centric rotors lasted for 8 trackdays and worn down.

These are Rotora rotors, 2 trackdays old. Wonder if it is me or the rotors.



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Old 05-02-2014, 07:57 AM   #2
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My rear non-sport rotors cracked in the same way at the track once. I don't know their original source. I don't use the emergency brake in the paddock but the hot pads could cause dissimilar cooling just being in proximity when really hot. I'm guessing that is what happened.
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Old 05-02-2014, 08:42 AM   #3
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Quote:
Originally Posted by sixshooter View Post
My rear non-sport rotors cracked in the same way at the track once. I don't know their original source. I don't use the emergency brake in the paddock but the hot pads could cause dissimilar cooling just being in proximity when really hot. I'm guessing that is what happened.
I don't use handbrake in the padlocks either. These cracked on the track. I m guessing is issues woth cross drill rotors.
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Old 05-02-2014, 09:41 AM   #4
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crack goes straight through the drill holes. This is not uncommon for drilled rotors.

use solid rotors.
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Old 05-02-2014, 01:28 PM   #5
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Quote:
Originally Posted by Track View Post
crack goes straight through the drill holes. This is not uncommon for drilled rotors.

use solid rotors.
+1
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Old 05-02-2014, 02:06 PM   #6
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Too many speed holes
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Old 05-02-2014, 02:09 PM   #7
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But unsprung weight is the devil and the rear brakes don't do anything!!!
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Old 05-02-2014, 02:13 PM   #8
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Quote:
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But unsprung weight is the devil and the rear brakes don't do anything!!!
people really do say the dumbest things sometimes, dont they?
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Old 05-02-2014, 02:20 PM   #9
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Lol fail, not a coincidence that the crack goes right through 2 of the drilled holes.

Rotora = no thanks. I'll stick with NAPA blanks.
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Old 05-02-2014, 04:54 PM   #10
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Drilled rotors suck [/thread]
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Old 05-04-2014, 08:37 PM   #11
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Came to say drilled rotors bad, but I'll see myself out now.
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Old 05-04-2014, 09:08 PM   #12
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Quote:
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Drilled rotors suck [/thread]
I have seen dozens of drilled rotors crack and never saw one that was not drilled crack. Seems to be a pattern here
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Old 05-04-2014, 10:35 PM   #13
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Originally Posted by Savington View Post
Drilled rotors suck [/thread]
+1. For well used / abused solid rotors, micro cracking is not fatal - but when that occurs in shitty drilled rotors, you are speeding for a bleeding.
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Old 05-05-2014, 12:22 AM   #14
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Quote:
Originally Posted by olderguy View Post
I have seen dozens of drilled rotors crack and never saw one that was not drilled crack. Seems to be a pattern here
I've seen non-drilled rotors cracked -- in fact, I cracked one myself. (11" Wilwood rotors on Goodwin hats). Mine cracked after I grenaded the tranny at Laguna and had to sit in the dirt with the brakes on (to prevent rolling backwards) for about 5 minutes while waiting for a tow. So it seems there really is something to those cooldown laps and parking it in the paddock with the parking brake off.

--Ian
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Old 05-06-2014, 07:55 PM   #15
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I cracked a non-drilled/slotted rotor once, but I was being a bonehead and running the rotors with substantial micro-cracking all the way around. Had I followed my own advice and pulled them when the cracks were 1/3 of the way across the rotor, it never would have happened.
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Old 05-07-2014, 10:54 AM   #16
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same, I also cracked some rotors pretty badly when the piston was seizing on one side and overheating the rotor
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Old 05-07-2014, 12:15 PM   #17
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At Road Atlanta:





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Old 05-07-2014, 12:29 PM   #18
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This rotors look like they needed replaced far before a track day at RA. ^^
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Old 05-07-2014, 01:04 PM   #19
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These are your rotors on crack

Crack.

Not even once.
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Old 05-07-2014, 02:21 PM   #20
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Interesting that all the pictures here are rear rotors. Are they more prone?
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