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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.
This sounds dumb, but I try not to look at that, just like I try not to look at my gas mileage. I live within 10 minutes of downtown, and drive around all day for work. I am stop light to stop light like a 16 year old with a new toy. Whatever mileage I get, either for gas or brakes, could easily doubled by an adult.
2011 - 2014 C63's equipped with the P31 Package, Performance Package, Development Package or 507 package (depending on which country you live in) were fitted with Brembo co-cast hybrid aluminium & steel brake rotors on the front axle, identifiable by the red brake calipers.
The Brembo co-cast concept is pretty innovative, having an aluminium hat casted with a steel rotor of which the major benefits are a lower unsprung weight, much better thermal stability than the standard C63 brake rotors and better ride comfort & steering response. The latter two factors are the most important for a C63 that is used on the road and not on the track.
The co-cast concept is still very relevant as they are currently fitted as standard equipment on many of the current generation AMG cars such as the aforementioned C63 S and AMG GT S models (GT S has them on both front and rear axles)
Ultimately, fully floating 2 piece rotors are better for track use, but co-cast discs are a good option for a road car, and certainly better than the stock C63 rotors.
2011 - 2014 C63's equipped with the P31 Package, Performance Package, Development Package or 507 package (depending on which country you live in) were fitted with Brembo co-cast hybrid aluminium & steel brake rotors on the front axle, identifiable by the red brake calipers.
The Brembo co-cast concept is pretty innovative, having an aluminium hat casted with a steel rotor of which the major benefits are a lower unsprung weight, much better thermal stability than the standard C63 brake rotors and better ride comfort & steering response. The latter two factors are the most important for a C63 that is used on the road and not on the track.
The co-cast concept is still very relevant as they are currently fitted as standard equipment on many of the current generation AMG cars such as the aforementioned C63 S and AMG GT S models (GT S has them on both front and rear axles)
Ultimately, fully floating 2 piece rotors are better for track use, but co-cast discs are a good option for a road car, and certainly better than the stock C63 rotors.
Before anyone else does so, I am going to ask:
Does "better ride comfort & steering response" simply refer to the lower unsprung weight which at least theoretically improves suspension control and steering just because of the slightly lower weight (because a lighter part can be moved more easily than a heavy one)?
I say "theoretically" only because while a racer on a track would feel the difference, I'm not sure that we mere mortals on a public street would. Also, some of our forum members would do the "cost versus benefit" analysis and say that, for the street, the extra cost might not be justifiable.
Does "better ride comfort & steering response" simply refer to the lower unsprung weight which at least theoretically improves suspension control and steering just because of the slightly lower weight (because a lighter part can be moved more easily than a heavy one)?
I say "theoretically" only because while a racer on a track would feel the difference, I'm not sure that we mere mortals on a public street would. Also, some of our forum members would do the "cost versus benefit" analysis and say that, for the street, the extra cost might not be justifiable.
Jim G
I can answer that. My non-gearhead girlfriend noticed when I swapped from one-piece rotors to girodisc 2-piece rotors. The fronts were 12 lbs lighter each. She said the car wasn't as bumpy even though we were driving on the same roads. She pointed it out without me telling her. She HATED how my car was on bumps. After the rotors she could tolerate it...until I put Bridgestone RE-71Rs on the car now it's stiffer than ever! I can't remember if I noticed anything through the steering. Maybe? That tells you how little the steering was affected. The ride quality was slightly improved though.
I can answer that. My non-gearhead girlfriend noticed when I swapped from one-piece rotors to girodisc 2-piece rotors. The fronts were 12 lbs lighter each. She said the car wasn't as bumpy even though we were driving on the same roads. She pointed it out without me telling her. She HATED how my car was on bumps. After the rotors she could tolerate it...until I put Bridgestone RE-71Rs on the car now it's stiffer than ever! I can't remember if I noticed anything through the steering. Maybe? That tells you how little the steering was affected. The ride quality was slightly improved though.
Wow, that's a good testimonial. It's one thing for a proud upgrader owner to say "it's noticeably better", but it's far more impressive to have your girlfriend point it out without you even mentioning it. So, that makes the question that each owner needs to ask: Is it worth $X for me to feel that difference? Some may say yes, and some may say no. But now with the multiple posts within the thread, it sounds like we have the information to make an informed decision.
12 lbs less on a wheel is pretty big. I know a lot of guys who have spent big money on wheels or tires that saved 5 lb per wheel.
Regardless of rotor construction (1pc, 1.5 or 2 pcs), OE discs are made of soft iron so they are bulky, heavy and prone to wear.
Here are pics of 1 pc rotor weight and its wearing pattern (disc surface becomes groovy).
Hundreds of happy C63 owners replacing their OE to RB light weight two piece, save not weight but money and trouble in replacement, including this E63 customer just replaced his RB discs after 114,000 miles.
RB is best known to produce the most durable rotor in automotive industry, from early Miata MX5 and WRX to today's Z06 and Camaro SS/ZL1.
See this in-depth review in BMW forum - A detailed description on how we test our rotors in hardness (In iron rotor hardness = Strength and Durability).
"Because I was very impressed with their patented designs (which I talk about below), and I was impressed with their detail to making a quality product."
Best 2 pc light weight rotor for grand sport... - RB 2 piece rotors were voted as the #1 choice by Corvette Z06 users.
Price includes industry's best street compounds (XT910). Low dust and no squeaking is just the default, consistent brake torque delivery and liner modulation is the difference you can feel and enjoy after installing these pads. https://www.racingbrake.com/Brake-Pa...pd1291-391.htm
I Installed the 2pc Brembo rotors on my 2013 C63 (w P31) instead of the OEM 1.5's that came on the car. I was lucky enough to have a close acquaintance that works for Brembo and this is what I was told.
The calipers on our cars are all built by Brembo across the board. The 2pc rotors are made and supplied by Brembo to MB and the 1.5's are made by MB's OEM supplier, interesting note is they see a 1.5 in development in the system specific to our application, they could be available any time now but they where not in stock in Canada as of last week.
The following applies to Brembo product.
2pc rotors are forged and will give you 1mm more material on the rotor before they need to be replaced.
1.5's are cast then machined flat
Cost wise $3400cdn pesos($2614.00usd) total including the dealer labor to do all 4 corners of the car (Brembo rotors, MB pads marked Brembo and MB sensors)
They look fantastic.
Yes we also offer carbon ceramic rotors (fits under OE red caliper, or RB calipers). The rotor will stay in "Black Gray" and with "Clean wheels"
See our most recent shipment to a Nissan GTR track racer upgrading from iron to CCB. Discs are made with continuous carbon fibers.
They look fantastic.
Yes we also offer carbon ceramic rotors (fits under OE red caliper, or RB calipers). The rotor will stay in "Black Gray" and with "Clean wheels"
See our most recent shipment to a Nissan GTR track racer upgrading from iron to CCB. Discs are made with continuous carbon fibers.
Front 394x36mm with 6 pot caliper:
Rear: 390x32mm with 4 pot caliper:
What a waste. There's like half the swept area of the disc not even being used. Nice for show I guess.
They are the same exact set up as it would have been installed in the car, if the illusion of shadow is eliminated however it's only a quick shot off our test bench.
12 C63BS Magno Alanite Grey, 25 X5 Msport, 08 BMW E93, Ducati Hyper 698
Generally the rule of thumb with the cracks is if a crack connects 2 of the holes or makes it to the edge of the rotor, it is time to replace before it cracks further and fails.
If the new rotors aren’t here by Wednesday... guess I’ll be dropping down a run group and keep it under 130 on the stretches �� and work on the Climbing Esses and the Snake ... Only 36 drivers signed up so far for the event... any speed at VIR with run groups averaging 10 drivers .. is pure joy!
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
now it's stiffer than ever! I can't remember if I noticed anything through the steering. Maybe? That tells you how little the steering was affected. The ride quality was slightly improved though.
Can i get the details on those black wheel studs and nuts??
