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Old 06-02-2016, 10:38 PM   #1
j5_sti
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Default hairline cracks on front rotors

how concerned should i be about my rotors looking like this? its the fronts only. i have about 600 track only miles on them. these are girodisc 2-piece rotors with Hawk DTC070 pads and brake ducts. am i able to get these rotors turned?

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Old 06-02-2016, 11:08 PM   #2
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Old 06-02-2016, 11:34 PM   #3
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Here here! As above perfectly put! (Or is it "hear hear"?)
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Old 06-03-2016, 12:54 AM   #4
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Any suggestions on pads?
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Old 06-03-2016, 05:00 AM   #5
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My fronts look the same using Napa blanks and dct60/dtc70 with ducts and ti shims
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Old 06-03-2016, 09:23 AM   #6
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That's common. The DTC70s are great pads in terms of bite and fade resistance but I found them to be very hard on rotors. That being said, your rotors are fine for now. Just keep an eye on the cracks and when you can start to significantly catch a fingernail on them and/or they spread to the edges, it's time to replace.

I'm currently using CL Brakes RC6 and they are outstanding so far. After a 3 day race weekend, the rotors are barely worn and the pads still have a ton of life left in them as well. Maybe a tiny bit less initial bite than the hawks but it's very close, and I couldn't get them to fade either.
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Old 06-06-2016, 08:26 PM   #7
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So new pads will bed okay and not wear out faster?
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Old 06-06-2016, 08:54 PM   #8
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Im on my second set of new pads on the same rotors. The small surface fractures dont seem to diminish pad life. Ive added ducts and shims this year and am seeing increased pad life with last years rotors which were already looking like yours
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Old 06-07-2016, 12:33 AM   #9
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I talked to Giro today and they're saying the same thing that this is normal. So I guess I will just monitor it and keep pushing forward.
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Old 06-07-2016, 10:05 AM   #10
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And this is why you buy $20 rotors for your track days (or whatever cheap blank STI rotors cost) when you don't have enough heat capacity.

OP, normal stress cracks developing from heavy heat cycling.

Run them until you can really catch your finger nail on them, then it's best to move on. Edit: as posted above.

The cracks will grow, and eventually the rotor will fail.
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