Possible brake issue on rotor - Mustang Evolution

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Old 01-26-2016, 02:39 PM   #1
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Possible brake issue on rotor

Hey guys. 2014 mustang v6 performance pack. My question (and some of you may laugh) but I really don't know much about brakes.

My question is. On the two photos I uploaded (both front rotors) I noticed those dark lines/circles appearing. Is this an issue that could turn into something worse or is this normal and will go away or what? Any advice would be comforting. Click image for larger version

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Old 01-26-2016, 04:40 PM   #2
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Anyone?


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Old 01-26-2016, 06:01 PM   #3
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Can you feel them with your finger (i.e. are they grooves)? If not, I wouldn't stress...probably just some contaminant that got between pad and rotor and should go away.

If the rotors are deeply gouged/grooved, you may need to do something about it, but doesn't look that bad at all from the pics.
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Old 01-26-2016, 07:25 PM   #4
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Not that i can feel I feel few bumps noting crazy though


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Old 01-26-2016, 07:28 PM   #5
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Old 01-26-2016, 07:53 PM   #6
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Then I think you're fine...kick back and have a beverage of your preferred type.
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Old 01-26-2016, 08:01 PM   #7
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They may be nothing or they could possibly be what is called, "Hard Spots". Hard spots may be the result of poor quality castings or from excessive heat that causes changes in the metallurgy of the rotors. Hard spots can often be seen as discolored patches on the face of the rotor.
Do you get any brake pedal pulsation or shudder when applying the brake (hard)? If not, I wouldn't worry about it.
If they are hard spots, they may eventually cause uneven wear that results in pedal pulsations when the brakes are applied. That's when you would consider replacing them.
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Old 01-26-2016, 08:28 PM   #8
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Quote:
Originally Posted by Diehard View Post
They may be nothing or they could possibly be what is called, "Hard Spots". Hard spots may be the result of poor quality castings or from excessive heat that causes changes in the metallurgy of the rotors. Hard spots can often be seen as discolored patches on the face of the rotor.
Do you get any brake pedal pulsation or shudder when applying the brake (hard)? If not, I wouldn't worry about it.
If they are hard spots, they may eventually cause uneven wear that results in pedal pulsations when the brakes are applied. That's when you would consider replacing them.
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Old 01-27-2016, 11:37 AM   #9
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Possible brake issue on rotor

I've been testing them and haven't been getting anything. Pulling , pulsation. Very very very minor when applying really really hard pressure is that normal? And do hard spots disappear?


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Old 01-27-2016, 11:40 AM   #10
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As mentioned they could be hard spots. If the dark marks are consistent the full circumference of the rotor it could be they were overheated...if they were overheated they could be warped and the pulsation when you apply the brakes slowly and evenly would show this. Also, depending on how many miles are on the car if someone replaced the brake pads without turning the rotors uneven ware could occur such as what you are showing in the pictures...as long as the pattern is the same all around the circumference of the rotor...IMHO
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Old 01-27-2016, 11:56 AM   #11
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The pulsation you may feel from hard braking is from the Anti lock brakes. Those marks look like normal wear and heat marks. Rotors are lighter than they were years ago so you will get wear marks in them as you put more miles on them. I have a 2013 with the performance package and my rotors look like yours. My color changes and more to the center than your, but no groves like yours. My car has 19k on it.
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Old 01-27-2016, 12:49 PM   #12
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Quote:
Originally Posted by 2013 RedMustang View Post
The pulsation you may feel from hard braking is from the Anti lock brakes. Those marks look like normal wear and heat marks. Rotors are lighter than they were years ago so you will get wear marks in them as you put more miles on them. I have a 2013 with the performance package and my rotors look like yours. My color changes and more to the center than your, but no groves like yours. My car has 19k on it.
As I mentioned above...."the pulsation when you apply the brakes slowly and evenly will show you if the rotors are warped. Applying the brakes such as a panic stop will normally pulsate because of the ABS...another cause of marks is uneven wearing of the pads or not bedding in of the new pads correctly or run-out of the disc. Although my car was a 14 TrakPak in the 10k miles I put on the OE rotors there were no marks of any kind on them...
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Old 01-27-2016, 12:52 PM   #13
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That sort of wear is totes normal. Hell you should see the rear rotors on my Expy lol.
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Old 01-27-2016, 02:10 PM   #14
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PP V6 brakes are same as GT brakes 05 to 09

Just looked at my 13 PP brakes and they look the same
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Old 01-27-2016, 04:06 PM   #15
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Reference to warped rotors is very common but I don't believe warped rotors are common at all.
I have experience at least a few cases of what feels like a warped rotor, over the many years that I have been driving and doing my own brakes. In every case, when I put a gauge next to the rotor and rotated it, I found it to be true. That is, not warped.
I believe in every one of my experiences, that either the rotor warps when heated while braking or that they had hard(hot) spots.

In fact I have the problem right now on my Charger. And it's been getting progressively worse as time goes by. At slow to medium speeds , no problem and absolutely no feel of pulsation when applying light to medium braking. But at higher speeds and braking medium to hard, I get the classic pulsating, and feel it strongly in the steering wheel. Time for a new pair of front rotors.

EDIT: Interesting article by StopTech
Myth # 1 – BRAKE JUDDER AND VIBRATION IS CAUSED BY DISCS THAT HAVE BEEN WARPED FROM EXCESSIVE HEAT.
http://www.stoptech.com/technical-su...nd-other-myths
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Old 01-27-2016, 06:19 PM   #16
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Pads also create a transfer layer of material onto the rotor surface. My Carbotech XP10s turned my rotors blue / purple.
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Old 01-28-2016, 12:04 AM   #17
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Long time form watcher. I got the pp pack and I'm around 50,000 km and mine pulsated the last 4 months I drove it... Should I consider switching my brakes out next summer? I'm from Canada, Saskatchewan to make it longer...


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Old 01-28-2016, 12:17 PM   #18
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Possible brake issue on rotor

Mine look the same, it's normal wear.


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Old 02-05-2016, 04:25 PM   #19
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I been playing with cars since 1969 and that is normal wear as for warped rotors I hear a lot about them but I have only had one set ever warp on me and among all my friends only seen two more in all those years and all 3 times they wear cheap no name rotor. Best brake set up I ever used and have been hooked on them since 1993 are power slot rotors and Hawk ceramic pads.
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Old 02-05-2016, 04:35 PM   #20
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I've had the cheap duracrap rotors warp on me. Since then I buy only Raybestos from Rockauto and have been totally good.

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