I thing the biggest issue with ABS on our cars is the electrical pickup from the rear diff. I have been considering this. Running the hard lines seems like it would be the biggest pita.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42