Right now I don't think I have any issues with my brakes other than the rear pads looking like it's about to be metal on metal contact, and the rear rotor is absolutely destroyed with grooves, the front was changed about 2 years ago by the dealership pads and rotors. All I want are drilled or slotted rotors that don't warp. I heard Zimmerman makes cross-drilled rotors for our cars.the stock brakes on all 3 of my w124's work great, I've never experienced fade or pulsing like I did on my volvos until I put Akebono rotors on them.
fyi, actually warped rotors are very uncommon... instead, you get uneven deposits on the rotors, and that causes pulsing when things get a little warmed up. properly heat cycling new brakes will forestall this.