Brake Dust
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From: The city of Hewitt in Central Texas
Brake Dust I have the Brembo drilled and slotted rotors with Wagner brake pads and they just dust terribly. Is it the rotors causing the dusting more or is it the pads? I never noticed this much dusting with the stock rotors.
The dust comes from the slotted and drilled rotors. The slits and holes eat up the pads much faster than on the stock flat surface. That's the trade off for getting drilled and slotted rotors, more brake dust. It's even debatable whether slotted/drilled really even help you, not to mention the fact that the disc's integrity has been compromised with the drilling. But, that's a different story.
TECH Fanatic
Joined: Sep 2004
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From: Las Vegas
Originally Posted by ArcticZ28
The dust comes from the slotted and drilled rotors.
Weather or not you have drilled/slotted rotors doesnt mean that the rotors are causing the dusting issue. Some, if not all performance pads have dusting issues not related to a rotor at all. It is true however, that slotting will help 'clean' the pad.... but it doesnt necessarily mean that it is cutting into the surface enough to eat the pads up. If it did, you would be replacing the pads every four to six months. Wagner pads are dusty, just like most of the true performance pads that are available.
Cross drilling does provide out gassing (but at the cost of mass and surface area), except for in an extremely wet environment and that is even negligible.
Slotting provides some out gassing and it will clean the pad surface, which may accelerate pad wear, but it to is even negligible.
Both however, will increase noise. Even more so if the rotor is coated, but that occurrence will go away once the rotor/pad path is cleaned of the coating itself.
Not trying to
or question your direction and knowledge..... just clairifing to real differences. There can and most likely are more than one cause to his stated brake dust issue. But to call its cause on the rotor alone, is quite trivial. 
Staging Lane
Joined: Aug 2005
Posts: 98
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From: Rancho Cucamonga, CA
Originally Posted by ArcticZ28
The dust comes from the slotted and drilled rotors. The slits and holes eat up the pads much faster than on the stock flat surface. That's the trade off for getting drilled and slotted rotors, more brake dust. It's even debatable whether slotted/drilled really even help you, not to mention the fact that the disc's integrity has been compromised with the drilling. But, that's a different story.
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Originally Posted by chicane
Uhm, not necessarily true..... at all. Dust comes from the pad, not from the rotor.
This is not a problem for most people though....
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Verdad Gallardo TECH Fanatic
Joined: Sep 2004
Posts: 1,124
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From: Las Vegas
Originally Posted by trackbird
Not if you run pads like I do. Then you get rotor dust as well (the pads grind up the rotors). My original 16" alloy wheels actually started to rust when stored in my garage over the winter....there is that much metal/iron coating the surface of the wheel. Aluminum won't rust, but the iron embedded into it will.....
This is not a problem for most people though....
This is not a problem for most people though....
The worst part is, that during development and before anyone had replacement 4-piston replacement rotors for the testing vehicle, is that if you ran the R4-S compound on the street it would eat 0.220" from the rotor in less than 90 days of street driving...... but man, did it ever stop !! Luckily this led to the developement of the "S" compound, so that you could get it in a street friendly version.
Here is a picture of my Principal Engineer, holding our new front brake package for the developement chassis, which just happends to be my personal '67.
