Patent ID: 7712844

Claim:
A master cylinder assembly for a brake system of a motorcycle, the master cylinder assembly comprising: a housing; a cover coupled to the housing to define a reservoir adapted to contain a fluid at a level, the cover including an aperture; a sight glass received within the aperture and adapted to indicate the level of the fluid within the reservoir, the sight glass having a top portion, a bottom portion, and a middle portion between the top and bottom portions, the top and bottom portions each having a perimeter sized to be received within the aperture and to seal the reservoir, the middle portion having a reduced perimeter relative to the top and bottom portions, wherein the sight glass is movable between a raised position where the bottom portion is received within the aperture and seals the reservoir and a lowered position where the top portion is received within the aperture and seals the reservoir, and wherein the middle portion allows fluid flow through the aperture when the sight glass is moved from the raised position to the lowered position.