Brake rotor after multiple track events: Replace or ok?

RN SHARK · 04-16-2016, 06:40 PM

So I have the Racing Brake 2-piece rotors, running XP-10 up front. This is what the rotor looks like. Is this fine or need to be replaced soon or now?

RN SHARK · 04-16-2016, 06:41 PM

And..

zpower86 · 04-16-2016, 08:30 PM

That would worry me, but I'll leave it to the more experienced to answer.

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wanabgts · 04-16-2016, 08:35 PM

You should be fine with those heat checking type surface cracks. I usually only worry if they are intersecting the edge of the rotor or they are longer than a half inch and opening.

Hope that helps,
Zack

dkmura · 04-16-2016, 08:59 PM

The heat cracking is normal, but you can't just use just a visual inspection. Get a micrometer to measure rotor thickness in at least three areas, Then compare the thickness to minimum specs to determine how much wear (if any) is left.

Rusty · 04-16-2016, 11:42 PM

That's surface cracks. Nothing on the edges. Measure the thickness of the rotor. To make you feel better. You can take a skin cut across the rotor on a lathe. Take about .005" per side off to see if it cleans up. But make sure you do not go under the min spec.

Me, I would mike the thickness to see how much is left. Then keep driving until I see bigger cracks. I have the same rotors.

RN SHARK · 04-17-2016, 12:01 AM

I also just noticed on the RacingBrake website that they do not recommend using Carbotech pads with their 2-piece rotors. Hmm. I'm going to measure them, but I feel better. Thanks all.

04-16-2016, 08:30 PM	#3 (permalink)
zpower86 Premium Member Join Date: Jul 2011 Location: Huntsville, AL Posts: 189 Drives: 2011 Nissan 370Z Rep Power: 14	That would worry me, but I'll leave it to the more experienced to answer. Sent from my iPhone using Tapatalk __________________ Charles K 2011 Nissan 370Z, Black, 7BS youtube.com/rotarypower86

04-16-2016, 08:59 PM	#5 (permalink)
dkmura Base Member Join Date: Feb 2009 Location: Aurora, CO Posts: 108 Drives: SCCA T1/3 and GT3 Z Rep Power: 17	The heat cracking is normal, but you can't just use just a visual inspection. Get a micrometer to measure rotor thickness in at least three areas, Then compare the thickness to minimum specs to determine how much wear (if any) is left. RN SHARK likes this. Last edited by dkmura; 04-17-2016 at 06:05 PM.

04-16-2016, 11:42 PM	#6 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,377 Drives: 2011 Nismo GM 6M Rep Power: 2684438	That's surface cracks. Nothing on the edges. Measure the thickness of the rotor. To make you feel better. You can take a skin cut across the rotor on a lathe. Take about .005" per side off to see if it cleans up. But make sure you do not go under the min spec. Me, I would mike the thickness to see how much is left. Then keep driving until I see bigger cracks. I have the same rotors. RN SHARK likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

04-17-2016, 12:01 AM	#7 (permalink)
RN SHARK Track Member Join Date: Jun 2011 Location: Delafield, WI Age: 44 Posts: 618 Drives: 09 370Z, 14 SRT GC Rep Power: 35	I also just noticed on the RacingBrake website that they do not recommend using Carbotech pads with their 2-piece rotors. Hmm. I'm going to measure them, but I feel better. Thanks all. __________________ ___________ '09 6sp/Z1/PowerTrix/SPL/Swift/SRP/Whiteline/F.I.LTH&CBE/UpRev by Seb/CJM/Stillen/Ings+1/RJM/TrackSpec/Sparco/Motul/Wavetrac/Coolerworx/Verus/CraftSquare '14 SRT Grand Cherokee; '08 TL Type-S

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04-16-2016, 08:35 PM	#4 (permalink)
wanabgts Base Member Join Date: Nov 2015 Location: Portland Oregon Posts: 36 Drives: 09 370z Nismo Rep Power: 10	You should be fine with those heat checking type surface cracks. I usually only worry if they are intersecting the edge of the rotor or they are longer than a half inch and opening. Hope that helps, Zack