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I have change my rotors on my CLK but I get a different opinion from everyone on what I should get. Should it be cross drilled or slotted ? Any recommendations would be great. Brand ? I did make up my mind to go with Porterfield brakes pads.

Mark[?]
 

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2007 ML350 Sport
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I have change my rotors on my CLK but I get a different opinion from everyone on what I should get. Should it be cross drilled or slotted ? Any recommendations would be great. Brand ? I did make up my mind to go with Porterfield brakes pads.

Mark[?]
I'll add my 2cents worth.
I've done allot of high-speed racing and gone thru numerous brakes and rotors.
In most cases for streetcars the drilled and slotted rotors are mostly for looks. The performance gains are nil. There are some potential problems with slotted rotor, depending on the manufacture but even the manufactures will tell you that the rotors may crake at the edges. And of course that can’t be good.

The drilled rotors are supposed to help release the gases created between the pad and the rotor during hard braking. But most streetcars never reach the point of to excessive gases during braking (I’ll try to explain this a little more). When braking hard the area between the surfaces of the rotor and the surface of the pad, create heat and gases. Between the two dissimilar materials gases are created. If too much pressure is applied the gas gets trapped between the pad and rotor. And prevent the pad from compressing fully against the rotor. That is why the holes and slots are there, to give the gas an escape path.

There are a lot of great brake products out there.
http://www.dilusi.com/
http://hp.brembo.com/
http://www.apracing.com/
http://www.ultimategarage.com/bigbrake1.html
http://www.baer.com/
http://www.stillen.com

The list goes on and on.
If you don’t race buy the rotor that looks the best to you. If you plan on racing be prepared to spend big bucks for a complete brake kit. Starting at around $1600.00 for fronts only, too as high as $18,000.00 for complete rotor and caliper set. This usually doesn’t include the master cylinder or related accessories.
Have fun,
Tim
 

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Gotta love that Magma Red. And those wheels are awesome. It's almost like looking in a mir...

Gotta love that Magma Red. And those wheels are awesome. It's almost like looking in a mirror, sorta!
Tim
 

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08 gl320 cdi
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If you are going for looks, get the crossdrilled and slotted rotors and include the cadmiu...

If you are going for looks, get the crossdrilled and slotted rotors and include the cadmium plating. The plating will prevent the rusting in the slots and the chamfered drill holes from forming.

The braking performance for everyday driving is based mostly on the size of the pad. The rotor contact area is actually reduced with crossdrilling and slotting, but they are needed for the reasons mentioned by Timster. Slotting also swipes the pad to make for a clean dry bite on the rotor.

There are problems associated with both types of rotors. I have seen hairline cracks emanating from the drilled holes from either really hard use or metallurgy quality.

I would go with a slotted rotor.
 
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