fiestaturbo.com

[fiesta_fras]

little snippet i found on the net

Mercedes is using a new type of brake rotor made of ceramics on one of its models like the one on the Porsche 911. The ceramic rotor is very lightweight and does not conduct heat into the hub, but it's also extremely expensive ($900 each!). It wears very little, but if it is damaged it can't be resurfaced and must be replaced. It also requires a special type of high temperature friction material to withstand the heat.

Mercedes is also using drilled and slotted rotors on some of its high performance models. The Chrysler engineers said they don't offer a significant improvement in cooling compared to a standard rotor, and are used primarily to enhance the "racing image" of the vehicle.

im sticking to plain discs from now on, no need for grooves and drills etc

[voorhas]

Hmmm... why should an S class Merc need to improve its "racing image"?

Taking into consideration the higher temps generated by those materials, I'd say the cross drilling could actually be beneficial (because of the gas formation between disc and pad @ high temps).

On normally equipped road cars, I would advise against Xdrilled based mainly on 2 reasons: the temps generated on road use aren't high enough to justify it, so the loss of contact area caused by holes would actually make them perform worse than regular discs and the fact that Xdrilled after market discs are just that: regular discs that are drilled, as opposed to Merc and Porsche items that are cast with the holes on them. And that makes them very prone to cracking.

Gonçalo D.

[fiesta boy]

mercs need good brakes the size weight and power of some of the cars is unreal