Join Date: Sep 2005
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The rust on the rotors surface itself will disappear once you drive off.
The brake pads floats on top of the rotors and it cleans it as it rubs the surface.
The rotor "cone" should not rust as it is coated from the factory.
It if did rust, I recommend to spray it with high temp engine paint, your choice of color.
As you know, stock BMW pads are quiet and provides very good grip but it emits a lot of dust.
I keep my wheels clean all the time by this method.
Everytime, before I drive off, I use Griots Garage Spray on car wash to clean my rims.
It literally takes 1 minute per wheel to spray this stuff and wipe down to clean the wheels.
I spray the same Griots Garage Spray on Car Wash to the tires. It removes the brake dust from the tires.
Brake dust on the tires are invisible but will transfer to anyone's clothing if they accidentally rub the tires.
So I spray the same stuff to the tires to clean it, then I apply very small amount of tire dressing.
Tire dressing: Apply once, then wipe off. If we dont wipe off and there is excess dressing left on the tires - the tire dressing will fling and transfer to the car body.
Hope that helps.