Mercedes casts their own rotors, or should I say they did until the new 2000 S-class. Both ATE & BREMBO are somewhat up-to O.E. quality.
Brembo is casting the new rotors for the "S" class. ATE doesn't make any pads. Stick with Pagid, Jurid, or Textar compounds, as they are all O.E. compounds. Almost all 1992 400E's have brake rotor warpage problems. Mercedes redesigned the brakes for 1993, different calipers & rotors. At the dealer we up-dated 1992's to 1993's for the warpage problem.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS M.B. TECH