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Old 05-26-2013, 01:46 PM   #1
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Default Rear 10.75 Goodwin v4 disc failure (now with PIC)

So what happened here?
Too much heat in rear?

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Old 05-26-2013, 01:56 PM   #2
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I want pictures of failure!
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Old 05-26-2013, 02:28 PM   #3
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Old 05-26-2013, 06:47 PM   #4
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hmm... thats odd.... i cant imagine THAT much heat building up in the rear, especially being big and slotted, and... in the REAR... maybe a manufacturers defect????
how old are they?
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Old 05-27-2013, 03:35 AM   #5
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Dunno what happened. Rotor fairly new (2 days) and torqued to spec.
Or I missed a minor crack and this developped?!
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Old 05-28-2013, 01:10 AM   #6
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Should dissipate heat better-LOL
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Old 05-28-2013, 01:24 AM   #7
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2 days, or 2 track days?

The only time I've cracked a rotor (a front) was after a tranny failure at Laguna where I pulled off track and wound up sitting there with my foot on the brake for 5 minutes (so it didn't roll downhill back onto the track) waiting for the tow truck. The lack of a cooldown lap really does make a big difference.

--Ian
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Old 05-28-2013, 05:53 AM   #8
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I had an identical crack (2-3mm gap at the rim) in a OEM rear rotor (251mm) that I noticed first when I was preparing for the next race. I have no idea if it developed during the race or sometime afterward (small elves killing rotors). That crack was clearly noticeable so I don't think I could have missed it at the track.

Wet race meaning sudden cool down?
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Old 05-28-2013, 06:57 AM   #9
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I've done no wet on this rotor. The only thing I can think of would be no-cool-down-lap-pit-in-handbrake-on-crack.
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Old 05-29-2013, 09:12 PM   #10
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My vote is on a sticking caliper/caliper sliders. I see other thermal cracks as well. Rears should last 20 days, not 2.
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Old 05-30-2013, 04:43 AM   #11
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Quote:
Originally Posted by Savington View Post
My vote is on a sticking caliper/caliper sliders. I see other thermal cracks as well. Rears should last 20 days, not 2.
If that includes overtightened parking brake adjust, you could have a point... switching to M-tuned kit with sport rotors soon so I can at least source replacement parts locally.
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Old 05-30-2013, 09:06 AM   #12
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Sometimes you just get a bad rotor.
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Old 06-02-2013, 04:16 PM   #13
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Switching to M-Tuned and sport rotors in rear: cheaper and easier replacement.
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