I get that it's physics of water getting on there causing the issue. I just know that some cars don't really have this delay, while others do. How much of that is the from the materials of the rotor and pad combination or from the fact that our alloy wheels are much more open, allowing more water onto the brakes vs. steel wheels with hub caps, I don't know.No combination of pad and rotor will eliminate that. It's simply physics.
E9X models incorporate brake drying where the pads and rotors are momentarily grazed against one another periodically in rain to eliminate this delay.
I did not know that the E9X models did this, very cool. Does it use the rain sensor on the windshield to determine that the conditions require the brake drying, or is there another sensor somewhere that handles that?