I'm in the process of updating my rotors and brakes on all 4 wheels of my 2015 c300. There is quite a difference in weight between the stock Mercedes rotors and any off brand rotors. I've seen differences if 20 pounds per wheel. Will the additional unsprung weight cause any major problems or should I stick with original parts. Any help greatly appreciated. Thanks

less weight means more noise. look at zimmerman rotors. use them all the time and never had issues.

Many like to reduce unsprung weight; but, rotors that are that much lighter would raise quality concerns in my mind. On a daily driver that is only five years old I'd use OE or OEM rotors and pads

Do you need rotors, can yours be resurfaced?

Just my $0.02!

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

I would think that lighter rotors would tend to warp easier.

Agree with could warp easier...not a desirable issue on a daily driver.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

20# per wheel more than the stock rotors? Seems impossible. I'd check that fact. I'd never put an extra 10# onto my unsprung weight per wheel. It will make it ride like a truck and hurt handling. I can feel a difference of 4# per wheel.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

You aren't seeing 20# differences per rotor. The mass of the rotors won't be dramatically different from manufacturer to manufacturer, because the dimensions are standard, and the density of iron alloys doesn't vary much. So stop exaggerating whatever problem you're seeing.

Unspring mass is really beside the point. The thermal mass of the braking system is as important to braking as any other characteristic. If you have a rotor with lower mass, it will have less capacity to absorb heat and will fade more quickly. Lightening your brake rotor is generally a bad idea.

you accusing me of exaggerating?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Not at all, the OP says his rotors are 20lbs heavier, that's what I was referring to. Two rotors of stock design are going to be very close in mass.

yes.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

ATE coated with Akebono pads. Done.

Don't do OE pads, they dust like mad and are annoying. OE rotors are fine. Whatever you get, make sure they are coated otherwise hats and vents will rust.

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"Fubu" - 1993 500E 199/271 (103K) 124.036
"Patty" - 1994 E320 Touring "Sportline" 172/174 (239K) 124.092
"Punch" - 1997 Porsche 993TT (34K) Hang on!

I would be surprised if one rotor was a pound heavier than another, unless you are talking about carbon fiber rotors vs iron.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

As already stated. I've been running Zimmerman rotors for years with no issues.

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Jim

I’ve ran the rock.Auto bottom of the bucket cheapies for years with no problems.

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

check out cquence dot net

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1990 190E 3.0L