The only difference between the 400E and the 500E brakes is the use of aluminum calipers I think... Use the 400's I think that they are cast iron and have fewer problems with calipers.

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Benzmac:
Donnie Drummonds
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM