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Got the 'check brake pad' alert and I'm due for new rotors so I'll be swapping out all 4 rotors/brake pads at once.
Likely going with Zimmerman's Z Coat rotors with OEM pads from a stealership.
I'm encountering conflicting info on rotor sizes, I measured my front drilled & vented rotors and it looks like they are roughly 330MM (33CM), but RockAuto was only selling 295MM front rotors in their c300 section. Ended up finding the z-coat 322MM rotors in the C350 section, will this cause issues or is it compatible?
My next issue is the rear rotor, since it's a sport package I was reading online that canadian models come with the larger front rotors and vented rear rotors, but currently the rear rotor is not drilled or vented and is solid. Will installing a vented rear rotor be an issue with the calipers with the thickness of vented rotors? The solid rotor is 10~MM thick, whereas the vented rotor is 22MM thick, but all info I've found online said my car should've came with a vented rear rotor, especially since it has the bigger rotors up front?
I found this part number on the rear brake pad/caliper: A 204 423 12 10, from what I found online this should fit 22MM thick vented rear rotors, but any confirmation would be great!!
Also open to any other rotor/pad combos that are considered the best for street use/stopping power, I don't mind the dust and prefer the stopping power of metallic over ceramics.
Thanks in advance, I couldn't find the above info in the sea of knowledge on this forum so any help would be appreciated. WDDGF8BB8BF581635
Last edited by w204enjoyer; Jul 23, 2025 at 01:46 AM.
Where can I find the model code from the data card, and by data card I'm assuming you mean a vin decoder? WDDGF8BB8BF581635
EDIT: I think I found it using other decoders, 204.081.
EDIT2: nemiga parts is showing a bunch of different rotors, e.g. for the front they vary from 295mm to 322mm which doesn't help my uneasiness when deciding on solid vs vented rear rotors using the site
Last edited by w204enjoyer; Jul 23, 2025 at 02:06 AM.
If nemigaparts.com is still showing multiple rotors, a dealer can give the exact rotor part numbers with your VIN. I’ve never had a U.S. MB dealer balk at giving me exact part numbers for our vehicles. They know you are going to shop price and don’t seem to care. I can then use those numbers to look up the diameters on various parts sites.
If you can, wait a couple of days and one of the Canadian members may have the exact answer.
If nemigaparts.com is still showing multiple rotors, a dealer can give the exact rotor part numbers with your VIN. I’ve never had a U.S. MB dealer balk at giving me exact part numbers for our vehicles. They know you are going to shop price and don’t seem to care. I can then use those numbers to look up the diameters on various parts sites.
If you can, wait a couple of days and one of the Canadian members may have the exact answer.
I've been in this situation. It is difficult to get a clear answer, so I recommend removing front and rear wheels and taking rotor measurements. It's the only way to be 100% sure.
Also, I recommend Brembo ceramic brake pads. Excellent braking performance, and zero dust. I fitted them on my C250, and they work brilliantly.
I have a 204.081 2010 C300 4matic Sport. I went with Zimmerman rotors, Ferodo semi metallic front pads and ATE semi metallic rear pads. I think they work great. The pads appeared to look the exact same as the Genuine MB pads I replaced from the car. These Zimmerman rotors seem much better than the Genuine MB rotors I replaced, the MB rotors looked rusty and were deeply grooved though I have no idea how long they were on the car if they were replaced with the pads last time.
Only complaint is the rims look dirty very quick, im always washing them.
Forgot to mention the size should be stamped on the rotors, may be able to read it looking thru the rims along the outer edge around the hub. Will have the Min thickness on it also.
Appreciate the info folks, I called around different dealerships to confirm part numbers.. A bit odd I was getting different part numbers from different dealerships, but I'm guessing that's due to multiple part numbers associated with a single part. front rotor
000421301207
0004211112
front pads
0054201520
0004209004
0004200105
rear rotor
2044231512
2044230912
rear pads
0074206020
0004200205
0004200720
sensor
2115401717
2115401817
Below is what I ended up ordering, based off my research these *should* fit. I also learned there's different brake pads on the rear depending on if you have a cast iron caliper versus aluminum.
For grease I use either Plastilube or Silglyde silicone lube. Only place I use it is under the anti-rattle springs on the front brake carriers and then on the rear carriers where the pads ride. Everything else like the caliper pins I clean really good with brake cleaner.
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Help! 2011 C300 4Matic Sport Rotor Size
