I have been through at least 5 sets of rotors on my 400E and I never could figure out why my brakes still pulsate. I just live with it. I may try to pull the ABS, but doesn't my car have some sort of electric pump as a primary for power assist (vacuum secondary)?

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