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I've had disc wear patterns on other cars I've owned in the past, but this is one I haven't come across before.
I switched from Brembo ceramic pads to semi metallic pads because I wasn't happy with the bite and fade braking from high speed.
No disc wear pattern problems with the ceramic pads, however, this has shown up after almost 2 yrs of semi metallic pads.
I know semi metallic pads really chew down the entire rotor fast from previous experience. These ones squeal like crazy at slow speeds during the 2nd year. No noticeable squeal the first year or very minor.
Has anyone seen this wear pattern on their front discs ? The outter lip is worn down more than the rest of the surface on the disc.
The picture doesn't show how uneven is the surface.
Evidently the holes show different wear.
Pull the wheel, find straight piece of steel, stick it to the rotor surface and estimate the groves depth.
Marking looks even around the rotor, so no immediate worry.
The wear pattern is common for drilled rotor, at least that is what happened on mine.
If you want longer rotor life when from new, clean often those holes. I clean mine often. Compressed air only . Wheel removed.
The wear pattern on your drilled rotors looks really smooth. I'd renew the discs when pads are history.
Keep the same setup as that combination proves to be working well.
Word of caution. Even asbestos is no longer used on brake pads, the dust is harmful to human lungs.
Use brake cleaner, not compressed air.
Last time the holes in my rotors had baked stuff in them and I had to use drill to clean them.
The lips on the ends of rotors develop at about 50% of rotor wear. I just grind them.
Mine look similar on my sport, I have semi-metallic pads on that, my luxury has the ceramics, they don't stop nearly as well, I actually have to watch if I go from car to car in a day, it's that different in stopping force and distance.
Word of caution. Even asbestos is no longer used on brake pads, the dust is harmful to human lungs.
Use brake cleaner, not compressed air.
Last time the holes in my rotors had baked stuff in them and I had to use drill to clean them.
The lips on the ends of rotors develop at about 50% of rotor wear. I just grind them.
I wear my N95 covid mask when doing working around brakes
But I plan to buy 3M full face respirator 6800, because I do not like fumes of solvents like Brake Clean.
However this respirator is not for one wearing eye-glass, if we want 100% seal. The eye-glass kit is crazy expensive for simple plastic and steel rod.
Per some brake pad sites and rock auto links they describe pros and cons of pad material
Below from Rock Auto which they pretty much show on every pad's info page.
From Rock Auto Brake Pad info page
I don't think this is accurate. OE pads on MB are organic and they are famous for very good braking power, while providing decent life. Big dust is correct.
I did not log that many miles on W212 to wear the pads, but I did on W210, where I switched to Akebono, where ceramic should offer lower brake power.
I could "stand the car on its nose" with either pads, but Akebono after 120k miles on them, did show 30% of wear.
I could never tell the difference between braking power, but other member did some test and ceramic pads took longer to stop the car, than OE organic.
Anyhow mine looked like that with the grooves and what not, big lips on the edges. This is in front fyi not rear. The holes in mine were completely clogged. Anyhow replaced them with brembo disks and akebono ceramic pads and stopping is much better and smoother. Ive only had them on for 600miles and week and a half. My original pads were at end of life about 1/8" left. Pretty even wear little thicker on outer pad.
The rear disk were very flat and even wearing, think about 1/4" wear left.
well my '12 luxury came with ceramics, at 30k miles currently, they are still more than half left, my sport came with semi-metallic, I clean brown dust from the '12 and not much, I clean black dust from the '13, considerably more.
I never check what kind of pads come on W212 and might be semi-metalic as I don't see much dust, but older models OE pads are organic for sure.
If you pay attention on parking lot, the 20 yo Mercedes do have dust-covered wheels and that was common problem when I drove W210
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