I remember reading the 123 Factory manual on brakes, was shocked to learn the factory recommends using a special brake pad to recondition rotor surfaces, in the boondocks or third world countries I suppose. They make (made?) them out of some sort of highly abrasive material (sandpaper grit?).
Clever, huh?

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!