Awesome writeup, thanks. Question: What is the purpose of the large plastic disk behind the rotor/bracket? I remember seeing that mine has a chip on the edge & I wondered if that created any issues> Thanks.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)