000 589 76 03 00 Box wrench - WS42.00-P-0078A
WARNING: This page is about a different car, the 2009 Mercedes-Benz E350 and 2008 Mercedes-Benz E350. However, it is still accessible from the selected car via links, so may be relevant.
FG 42/Set A
MODEL 164, 211, 251
Use:
Box wrench for screwing the brake hose on and off at the floating brake caliper or fixed brake caliper and for screwing the brake hose on and off at the brake line of the floating brake caliper.