WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.
0492458 341120 Gauge MW
NOTE:
For checking the brake piston setting in the front fixed calliper, brake piston diameter 54...57 mm / single-circuit brake system [discontinued]