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I see some black dot on the rear rotors. Should I be worried? What is that?
- They seems symmetric, like apart from each other 120 degree
- Both left and right rear rotor has them, same spots
- it is new car, just 8000km-ish
- my GLC has sport and night package
- One of them has a bit indent on it, is this wear indicator? I am just guessing.
Last edited by abacnus; Jul 9, 2020 at 06:58 PM.
Reason: correct 120 degree
I noticed these on my GLC too and I asked the MB Service Manager what they were. I believe he said they may be used in production to hold the rotors in a particular position by the automated robots. In any any case, I don’t think they are anything to be worried about. But they are definitely noticeable and sort of look out of place.
And they may very well be wear indicators. Once they’re gone maybe your rotors are getting too thin. I didn’t pursue it, but please let us know if you get an answer from your MB service guys.
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