is it worth the money?
 

are cross drilled rotors worth the money? do they perform any better? do they last longer? has anyone put these on their benz? any info would be appreciated

I don' t think they are. I hear they are more prone to crackings because of the holes.

ok then. are the one they call vented with the fins in them any good or dhould i stick to stock?

If I were you.. I would go stock.

I am not sure if they have "fins"... but the vented ones make me thing you're talking about the drilled holed ones. The only time I would see having cross drilled rotors as something to think about would be on performance cars, something a 300SD is not. Even in those cases of where performance cars do take them, they don't last as long. I gathered this knowledge from reading people's findings on their cars...

my mistake made a post on my dads account.

mercedes uses cross drilled ones on their newer uper class cars ie new S. I have heard they do perform better and all high end brake systeams use them like brembo. also any new motorcycle uses rotors with a extreamly large amount of holes and i no one no-one who's rotors have cracked. In my non-perfesional opinon cross drilled rotors are a good upgrade although better break pads will help too.

I bought my slotted rotors(front and back)
here.

http://www.raceshopper.com/sp_mercedes.shtml

They have only been on my 84 wagen for about a
month and a half,which is not enough to make
any assessment on which is better. But to me
having the piece of mind that my brakes will
still work when traversing flooded highways
is more important than price.
(and here in N. New Jersey it happens alot).
Plus when going down steep long hills,you're
less likely to have brake fade.


Louis.

The rotors used on newer MB and Porsche, etc. aren't prone to cracking because the holes are CAST into the rotor. Rotors with the holes simply drilled through are prone to crack. Stay away from the "Brembo Cross Drilled Rotors" that you see on eBay.

Mercedes has been using vented front rotors as original equipment for decades...

my fronts arnt vented. they look just like the rear ones but without the space for the e-brake

The only reason I would think you need them on a street car is looks. They look cool and if you have an aftermarket rim that shows your rotors then they would be a nice upgrade. Since I changed my rims, I'll be putting a set of drilled rotors on when the ATE power disc 's wear out.

Guys,

The vented front rotors on MBs is a feature added to their faster and heavier cars originally and the point was to reduce fade by reducing the operating temperature by cooling on both sides of each swept surface area of the rotor. The vented rotors draw air in at the inner opening and push air out at the rim. They are quite effective, but if MB decided you did not need this feature and you drive within the envelop they used to make their decision, you probably don't need them. If you want them though, I would be inclined to find the gas model of your car, which probably did go fast enough to warrant the selection of vented front discs, and install them if you can. They may be a little thicker and require new calipers as well.

Cross drilling adds some cooling but it also reduces the rotating inertia of the wheel, which can be a very large number if you are going very fast. On racing cars where the actual car mass is very low, the rotating inertia can be the bulk of the load, with those large diameter, very wide tires. Reducing the rotating inertia can significantly improve the braking performance, including reducing the tendency to fade with repeated applications of the pedal. This comes mainly from the reduced heat load due to the lower rotating inertia. I personally would not bother with cross drilled rotors on a typical vehicle being used in the city or highway at normal speeds, for performance reasons. But they do look cool. Jim

this is all i can find on fastlane or european automotive

or this. whats the point of the desigh?

so witch one? i need to replace one of the rotors because of it being unevenly worne past the point of being turned. als the pad is cracked and rubbing all the time.

also what kind of pads should i get?

bump

The 6.3 had 4 wheel discs with vented rotors.

I like PBR (REPCO) dustless pads. OEM are fine too.

kmaysob I have the rotors in the 2nd picture on my car now. The reason for the slots is to let gas escape that is formed when braking.

But the real reason I have them on my car is the wow factor. You can see them threw my rims and they look cool.:cool: A lot of my friends have done a double take on them.

I have a little experience with this, though not on a Benz. I had a Mazda 323 GTX (4wd turbo car) that had warped rotors in front. I replaced with drilled/slotted rotors. There was no improvement in braking, though the rotors did not warp again.

What I learned later is that warping occurs when you come to a stop after braking hard, and the hot pads sit against the rotor, keeping that part of the rotor hot while the rest of the rotor cools at a different rate. Slots and/or holes allow the entire rotor to cool at a more even rate.

I also learned that the most important factor for a braking system to work well is the ability for the rotor to store heat. So what you want is lots of mass in the rotor, and drilling and slotting removes mass, thus diminishing braking ability.

I would agree with the folks above who suggested going with a larger size stock rotor, if possible, and preferably vented, and maybe get them slotted at most, which will help the gas escape between rotor and pad. I've read that these slots also help clean off the surface of the pads to maintain a better braking surface.

As for pads, the best I've ever used is Porterfield R4-S pads. Don't know if they make them for Benz cars, but they are truly incredible pads with great stopping ability, great bite when cold, no dust and long wear. They are pricey but worth every penny, IMO. Check it out:

www.porterfield-brakes.com