Originally Posted by PC Valkyrie
The brake dust/material within the rotor holes will eventually fall out. Note that the powdery brake dust in your rotor holes is not the cause of the brake judder. You may or may not be able to see a layer of brake pad deposit material on the rotor itself. If there are more deposits in a certain area compared to another, that's the cause of the brake judder.
And yes, I forgot to mention stainless steel brake lines. When the system gets hot, the rubber brake lines expand, causing that "mushy" feeling at times when you are pushing it. Upgrading to stainless steel brake lines are another cheap way to get rid of that.
Well, the juddering is gone just like you said but the brakes have always felt a little soft compared to bimmer's..but thats under normal driving and not when they're hot...i've driven other mercs and they all kind of feel the same too. I think if I track my car more I'll upgrade to semi metallic pads and steel lines?