The description in this thread seems consistent with what I am experiencing ...

85 300SD - Brakes - ABS noise/softish pedal?

I'll do the tone ring cleaning on RF sensor ... the sensor checked OK in resistance test ...but the 8.15 VDC expecting 4 VDC is still the only thing I can consistently point to as likely cause factor.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg