kickinrocks

Hello all, I know this basic concept has been beaten to a pulp on this forum but my question comes from a slightly different angle. I have a 2013 C63 with the p31 brake package. From other posts I've seen the options exhausted as to which rotors to use as replacements for my car - as 1-piece rotors are significantly cheaper and work in place of the (1.5 piece) p31 rotors. My connection here in So Cal actually get's the 2 piece p30 rotors at a price significantly cheaper than the 1.5 piece p31 rotors. My question is 2 fold, #1 will the 2 piece p30 rotors fit on to my p31 (I know other 2 piece rotors like RB fit) and #2 is there any disadvantage to using the 2 piece P30 rotors (assuming that they do fit) as opposed to the 1.5 piece p31s? Thanks for your input in advance!

kickinrocks

These are the specific p30 rotors that I'm referring to to be exact

604 C63

1) yes, the P30/P31 tag is interchangeable. I had an 09, it was a P30, brakes, suspension but no extra power.
I now have a 12, it is said to be a P31 since it has the extra power, but on the build sheet it is listed as P30 with performance package. I am in Canada by the way, so they code a bit different. I could type for days on this, but just know P30/P31 is interchangeable for the purposes of this conversation. Just check your part number (I am unsure of that one, tho the 360 portion of that code is the correct sizing) and you will be good to go. I have yet to see any models of non- Black Series C63 where the rotors aren't swappable. So if them are listed as being P30 for some reason, have at er.

2) No. If their two piece are the same as Girodisc etc they will be lighter and stronger than the 1.5, for a savings in unsprung weight. Theoretically you should also be able to just by the rings in the future, and re-use the hats, unlike the 1.5s. Also, if they are similar to what I had they will be truly directional, whereas OEM does not have a L or a R, and the ventilation vanes are angled backward on one side. All things being equal I would definitely take the 2 piece over the 1.5s, which are a bit of a scam, IMO.

OEM rotors and pads are Brembo's btw.
Now whether its worth the extra over going with the normal rotors.....I would say only if you track your car. I have had both the Girodisc and the Evosport. They do not stop any shorter than OEM (and some would say longer when cool) but they do stand up to track use better, plus there is that savings in unsprung weight.

So to recap: 1 - yes. 2 - no.

kickinrocks

Thanks for the reply. I don't understand your answer to the first question though... The p30/p31 can't be completely interchangeable (at least here in the states) because the brakes are different (1.5 vs 2 piece) and different part numbers.

604 C63

There are only 1 and 1.5 piece. They call them 2 piece, but they are 1.5 really cos the hats arent reusable, and you cant get just the rings. Which makes them more a 'fancy 1 piece' in my opinion. The P30/P31 thing is handled a little different on the two sides of the border, and that DOES NOT HELP AT ALL lol.

All necessary specs are the same between the models though, and thats what matters. If they fit a 'regular' C63 they will fit a P30 will fit a P31 will fit a 507.

As I mentioned, I have done brake job/swaps on a regular 08, a P30 09 and a P31 12 using OEM, Girodisc, Evosport rotors and OEM, Porterfield, and Hawk pads. Any of those parts would have fit on any of those cars.

kickinrocks

Are you sure? I thought the p30 had actual 2 piece rotors while the p31 has the 1.5 piece stock...

realjones88

1) Yes. Another member recently did the same thing on his p31 car as the P30 two piece can be had for $400 vs. like $780 for the stock p31.

2) No as they weigh about the same and both are a good bit lighter than the solids. The Racing Brake are even lighter if you want to spend more.

604 C63

THEY ARE ALL INTERCHANGEABLE.

The original 09 P30 rotors I had were 2 piece, but it was worthless because I could not buy just the rings.
Mercedes has not used a product with re-usable hats and orderable rings.
The 2012 I have now is listed as P30 with Performance Package (which equates to P31 here in Canada) and they are 1.5
Your 2013 will have 1.5.

Do not let the different models mess with your head. They all fit. They are all the same size.

kickinrocks

That's what I thought! Thanks for the clarification. I'm assuming the 2 piece p30 are better then the 1.5 piece p31 so why the hell are the 1.5 piece p31 twice the price of the 2 piece?? Lol

604 C63

I almost didnt want to answer this question cos we are now probably get in the whole merry go-round of answers re 1/1.5/2 piece AND P30/P31 AND certain model years AND Canada/US/ROW model codes lol.

Regardless, excepting the black series, its all interchangeable. I have yet to see otherwise.

Nando_514

604 is right. Those rotors will be fine. You won't have any problems. They're all the same diameter, width and bolt pattern lol

m a x i m u s

604, you are a very patient man, just sayin'.

604 C63

Thanks. NO ONE is ALL bad lol.

Mag1c Carp3t

Does Racing Brake actually sell rings seperate form their hubs.

604 C63

Yes, I have seen a part number, tho I have not ordered. I have the link somewhere. Ill find it and then edit it in to this post

EDIT: Here. That was easier than I thought lol

http://www.racingbrake.com/C63-AMG-R...308-03-381.htm

realjones88

And the Racing Brake replacement rings ONLY fit Racing Brake hubs.

Brembo does not sell just the ring for their hub for some reason.

kickinrocks

realjones88

Not sure where this idea of inferior comes from because it's wrong. The 1.5 piece is a newer design used on basically all new AMGs, including the W205 C63 and some others (not sure if it's the same part # though).

Also the P30 rotors used to be just as expensive and if I had to speculate I would say they are cheaper now that Brembo is offering them directly.

604 C63

^^^^^^This.

kickinrocks

The idea of the 1.5 piece being inferior comes from 604s previous statement:
"No. If their two piece are the same as Girodisc etc they will be lighter and stronger than the 1.5, for a savings in unsprung weight. Theoretically you should also be able to just by the rings in the future, and re-use the hats, unlike the 1.5s. Also, if they are similar to what I had they will be truly directional, whereas OEM does not have a L or a R, and the ventilation vanes are angled backward on one side. All things being equal I would definitely take the 2 piece over the 1.5s, which are a bit of a scam, IMO."

604 C63

Sorry, I was referring to a true two piece aftermarket such as the Girodisc or RacingBrake.
You can buy these for the same price as the P31 rotors, or cheaper, and they are better and lighter.

Remember this quote lol

Nando_514

Smh... This conversation is... interesting, to say the least. I'm not sure why "inferiority" is even being discussed at this point. That question is ambiguous with no true explanation. The answer is the same, whether it be a C63 or a Corolla. 'Why did they choose "inferior" products? Because $$$$$$$$$$$. That is the ONLY logical explanation as to why MB would go with a 1 or a 1.5 piece over a 2 piece... Lol think about the multitude of things that could go wrong with a 2 piece, over a simple, solid piece of metal (1 piece).

JimGnitecki

Thank-you, 604. That was a GREAT explanation for us newbies to the C63.

Jim G

604 C63

Thanks. For the sake of clarity I would re-explain the following:

If I had a P30/P31 car that needed new rotors...

If I did NOT track it semi-regularly I would buy the NON P30/P31 rotors, meaning OEM for base C63. It simply is not worth virtually any differential in cost. You will not see any performance difference on the street, so you may as well go with the cheaper rotors.

If I DID track it semi-regularly I would buy aftermarket rotors instead, for the reasons I stated. Harder, lighter etc for the same price or even less, plus reusable hats.

While there is nothing wrong with them, there is no circumstance where I am buying the P30/P31 rotors, just because there are options that are better, cheaper or both.

betrezra

Thx for the info on this..... I've wondered about this as well.

As a pt of ref.... how many miles are people getting off the 1st set of rotors? with street use? with track use?

I'm @ 14K miles with a few track days on 1st set of rotors... still in spec per MB (last svc)... but a noticable lip by touch.