Weird Marks on my Rotor

b1adesofcha0s · 06-27-2012, 10:27 AM

Saw these weird black marks on my front driver's side rotor yesterday. They are about evenly spaced and go all the way around. This is the only one of my rotors that are like this, the other 3 are perfectly fine. Anyone know what they are and how I can get rid of them?

The brakes work perfectly fine, no vibrations or anything. The marks wouldn't wash off when I washed my wheels yesterday. I was thinking they might be pad deposits, but I wasn't sure. I'm running Carbotech XP8 pads all around.

m4a1mustang · 06-27-2012, 10:38 AM

They look a bit like hot spots.

speedfreek · 06-27-2012, 10:48 AM

Yep definately hot spots or hard spots caused by excess heat. Could cause vibration over time. You need to re-bed them.

b1adesofcha0s · 06-27-2012, 10:54 AM

Thanks guys, I'll try to re-bed them later tonight.

m4a1mustang · 06-27-2012, 10:55 AM

Quote:

Originally Posted by b1adesofcha0s

Thanks guys, I'll try to re-bed them later tonight.

Have fun

b1adesofcha0s · 06-27-2012, 11:00 AM

Quote:

Originally Posted by m4a1mustang

Have fun

I will, just gotta find the right time and place to do it.

I find it a little strange that it only happened on only one rotor and not the same one on the opposite side.

DR_ · 06-27-2012, 11:05 AM

VDC at work.

b1adesofcha0s · 06-27-2012, 11:07 AM

Quote:

Originally Posted by DR_

VDC at work.

MattP725 · 06-27-2012, 12:15 PM

It is also possible that you have a caliper that is not retracting properly (dirty or seized piston) and is applying some additional load even when the brake isn't depressed but you would probably notice some pulling if that was the case.

I had a seized caliper on a car and it made some awful looking heat spots but they don't really seem to impact anything.

b1adesofcha0s · 06-27-2012, 12:20 PM

Quote:

Originally Posted by MattP725

It is also possible that you have a caliper that is not retracting properly (dirty or seized piston) and is applying some additional load even when the brake isn't depressed but you would probably notice some pulling if that was the case.

I had a seized caliper on a car and it made some awful looking heat spots but they don't really seem to impact anything.

Nope, I haven't noticed any pulling. Hopefully it is just the hot spots and they'll go away after I re-bed the brakes.

SPOHN · 06-27-2012, 12:33 PM

Carbotech FTW

martin82 · 06-27-2012, 06:10 PM

I have the exact same thing happening to my rotors right now with the hawk plus pads all around after I went to chuckwalla at 100deg few weeks back. Hot spots turning blue etc,

corbin09 · 06-27-2012, 06:36 PM

Our OEM rotors are not very good. I would go with something a little more durable if you are going to be running aggressive pads.

martin82 · 06-27-2012, 06:44 PM

I'll be replacing the front rotors with dba 5000 2 piece, not sure yet what on the rear......... I will be running softer compound pads in the rear next time around

b1adesofcha0s · 06-27-2012, 06:50 PM

Don't have money to upgrade them yet so I'll stick with the OEM rotors as long as I can.

06-27-2012, 10:27 AM	#1 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	Weird Marks on my Rotor Saw these weird black marks on my front driver's side rotor yesterday. They are about evenly spaced and go all the way around. This is the only one of my rotors that are like this, the other 3 are perfectly fine. Anyone know what they are and how I can get rid of them? The brakes work perfectly fine, no vibrations or anything. The marks wouldn't wash off when I washed my wheels yesterday. I was thinking they might be pad deposits, but I wasn't sure. I'm running Carbotech XP8 pads all around. __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

06-27-2012, 10:38 AM	#2 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	They look a bit like hot spots. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

06-27-2012, 10:54 AM	#4 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	Thanks guys, I'll try to re-bed them later tonight. __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

06-27-2012, 12:33 PM	#11 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Carbotech FTW __________________

06-27-2012, 06:50 PM	#15 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	Don't have money to upgrade them yet so I'll stick with the OEM rotors as long as I can. __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

06-27-2012, 10:48 AM	#3 (permalink)
speedfreek A True Z Fanatic Join Date: Feb 2012 Location: Huntsville,AL Posts: 1,724 Drives: '12 370Z PW 6sp Rep Power: 18	Yep definately hot spots or hard spots caused by excess heat. Could cause vibration over time. You need to re-bed them.

06-27-2012, 11:05 AM	#7 (permalink)
DR_ Track Member Join Date: Jul 2009 Location: Dallas Posts: 981 Drives: Touring/Sport M6 PG Rep Power: 17	VDC at work.

06-27-2012, 12:15 PM	#9 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 17	It is also possible that you have a caliper that is not retracting properly (dirty or seized piston) and is applying some additional load even when the brake isn't depressed but you would probably notice some pulling if that was the case. I had a seized caliper on a car and it made some awful looking heat spots but they don't really seem to impact anything.

06-27-2012, 06:10 PM	#12 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 20	I have the exact same thing happening to my rotors right now with the hawk plus pads all around after I went to chuckwalla at 100deg few weeks back. Hot spots turning blue etc,

06-27-2012, 06:36 PM	#13 (permalink)
corbin09 Track Member Join Date: Jun 2009 Location: Dallas tx Posts: 665 Drives: 370z Rep Power: 280	Our OEM rotors are not very good. I would go with something a little more durable if you are going to be running aggressive pads.

06-27-2012, 06:44 PM	#14 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 20	I'll be replacing the front rotors with dba 5000 2 piece, not sure yet what on the rear......... I will be running softer compound pads in the rear next time around

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