New rotor question
 

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!!!

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

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

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.

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?

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.

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.

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

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

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

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