Thanks, MB Doc. I guess that's good news. I've read that the front disc usually goes bad before the rear. I'm getting a clunk when I put it in gear so maybe I'll try the front to see whether it softens it up. After doing the transmission and motor mounts, for some reason the clunk seems more noticeable now.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles