390 mm black series rotor conversion
Dimensions: 6.5B X 19 H2 ET14
Cheaper options exist on Ebay, etc.
Part # was given to me by Tracy via her EPC access (legendary online MB Parts guru who's helped source other esoteric MB parts).
I had asked a few BS owners about their exact Spare Wheel part number, but other than 1 confirming they had a spare wheel, they never got back to me re: Part #.
Would greatly appreciate if any W204 Black Series owners could chime in here; TIA.
I have a very similar setup to your Wilwood / Audi application on my C5Z track rat using Wilwood calipers made to fit over OEM sized rotors using a custom caliper bracket. The application was different in that I was trying to get the widest choice for 20mm thick race pads in standard race caliper shapes (either 7420 or 8350), which the Willwoods accept. The 7420 pad leaves the same unswept ring on the rotor toward the hub (it's a 43mm depth) whereas the 8350 is 50mm deep and sweeps the entire rotor ring area, but that doesn't affect the braking performance. What I did notice was that using one-piece steel rotors would simply overheat to the point where they were unable to cool off and furthermore melted(!) aluminum lug nuts to the wheel studs, whereas neither I nor my wife (who is actually harder on the brakes than I am ) have been able to ever get any kind of brake fade with two-piece rotors on a track that is VERY demanding on the brakes (repeated and sustained brake applications from 240 km/h to 100 km/h speeds). Any idea if those 380mm rotors are one piece or two piece?
I have Ferodo DS2500 in the wilwoods on the Audi. Love that compound.
According to the print that he posted, those 380s are two piece.
I think my plan is to get the 380s and make some spacers for my caliper brackets.
We used various spacers for testing purposes to get the Wilwoods to sit where we needed them, but once they were centered properly, we had a bunch of custom caliper brackets made from 7075 Aluminum. They get replaced once every couple of years when the calipers get rebuilt just to be on the safe side (fatigue and all).
We used various spacers for testing purposes to get the Wilwoods to sit where we needed them, but once they were centered properly, we had a bunch of custom caliper brackets made from 7075 Aluminum. They get replaced once every couple of years when the calipers get rebuilt just to be on the safe side (fatigue and all).
I would, yes.
With proper ARP hardware which is massively overkill, and having been properly torqued to the ARP spec with moly lube I wouldnt hesitate.
I don’t know what the diameter or pitch of the factory bolt is, and if someone can tell me, I’ll happily calculate the clamping force on the spacers at the ARP torque specs. It is likely many many times the weight of the entire car PER BOLT. So when properly torqued, there is basically no shear force on the bolt. Only tensile. All of the shear is dealt with by the spacers/etc...
I honestly wouldn’t use aluminum if you’re concerned with fatigue. I would seriously consider upgrading to 300M. It is considerably heavier than aluminum but on a small part like a caliper bracket it’s a small price to pay.
The Best of Mercedes & AMG




I eventually put a YFS Grade 12.9 70mm length bolt there, which fit perfectly.
I eventually put a YFS Grade 12.9 70mm length bolt there, which fit perfectly.
Er mah Gherd!!!
I just went down the ARP rabbit hole, and got lost in the engineering handbook for fasteners.
The simple answer is that clamping force of a properly torqued fastener = cross sectional stress area times the rating.
ARP rates their 8740 alloy at 200k pissys.
12x1.5 fasteners have a cross sectional area of 88mm2.
After the conversion circle jerk is shaken out, each fastener from ARP is rated to just over 27,000 pounds, Or just over 13 tons clamping force.
I just went down the ARP rabbit hole, and got lost in the engineering handbook for fasteners.
The simple answer is that clamping force of a properly torqued fastener = cross sectional stress area times the rating.
ARP rates their 8740 alloy at 200k pissys.
12x1.5 fasteners have a cross sectional area of 88mm2.
After the conversion circle jerk is shaken out, each fastener from ARP is rated to just over 27,000 pounds, Or just over 13 tons clamping force.




I just went down the ARP rabbit hole, and got lost in the engineering handbook for fasteners.
The simple answer is that clamping force of a properly torqued fastener = cross sectional stress area times the rating.
ARP rates their 8740 alloy at 200k pissys.
12x1.5 fasteners have a cross sectional area of 88mm2.
After the conversion circle jerk is shaken out, each fastener from ARP is rated to just over 27,000 pounds, Or just over 13 tons clamping force.
between this and the other big brake threads, to do front and rear brake upgrade to fit my stock 507 19" wheels as well as my aftermarket 19" track wheels would take;
-The 390mm front rotors from fcp or mercedes A2304211212, or RB rotors
-the ebay front caliper brackets linked by MBNRG to get the stock 507 wheels to work
https://www.ebay.com/itm/MercedesBenz-AMG-C63-W204-390mm-Brake-Bracket-upgrade-C63-Black-Series-/324435447162?_trksid=p2349624.m46890.l49292
- 4 of the YFS Grade 12.9 70mm length bolts referenced by BLKROKT for front caliper brackets, is there any mercedes part number or link to the exact bolts needed?
-the 360mm rear rotors (mercedes or RB), can someone help.with mercedes part number to compare with RB rotor cost?
-rear Caliper - Mercedes-Benz (212-423-68-98)
-rear Caliper - Mercedes-Benz (212-423-69-98)
-and the rear calipers will mount up with my stock 507 hardware with no extra brackets or longer bolts?
Thanks for the help
Last edited by Dr.Speedfellow; Feb 20, 2021 at 04:46 PM.
between this and the other big brake threads, to do front and rear brake upgrade to fit my stock 507 19" wheels as well as my aftermarket 19" track wheels would take;
-The 390mm front rotors from fcp or mercedes or RacingBrake A2304211212
-the ebay front caliper brackets linked by MBNRG to get the stock 507 wheels to work
https://www.ebay.com/itm/MercedesBen....m46890.l49292
- 4 of the YFS Grade 12.9 70mm length bolts referenced by BLKROKT for front caliper brackets
-the 360mm rear rotors
-rear Caliper - Mercedes-Benz (212-423-68-98)
-rear Caliper - Mercedes-Benz (212-423-69-98)
-and the rear calipers will mount up with my stock 507 hardware with no extra brackets or longer bolts?
Thanks for the help




when I looked at Brembo GT kit for c63 just the rears were $3500+ with 345mm rotors
I have not bought anything yet, just planning for the future
Last edited by Dr.Speedfellow; Feb 20, 2021 at 06:04 PM.
Are the $350 eBay adapters the only ones available?
feel like I’m getting taken to the dryers paying almost $400 usd for 2 caliper adapters.




I used BoltDepot.com for those YFS caliper bolts. Have been happy with all the hardware bought there.
Last edited by BLKROKT; Feb 20, 2021 at 10:11 PM.
Their customer service is lacking for sure.
I messaged epytec Germany to see if they still were making the c63 brackets. I may be able to get them
Copied once I have a set in my hands.
I used BoltDepot.com for those YFS caliper bolts. Have been happy with all the hardware bought there.






