Identical problem with my 1985 190D. same symptom, same speed (see my post " problems with 201 chassis-various"). I thought it was the flex disc. Never thought rotors...

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1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"