Patent ID: 8448762

Claim:
A hydraulic brake lever apparatus comprising: a brake lever housing including a cylinder; a piston movably disposed within the cylinder of the brake lever housing; a mounting assembly configured to mount the brake lever housing to a bicycle handlebar; a brake lever pivotally mounted to the brake lever housing and arranged to move the piston within the cylinder in response to pivotal movement of the brake lever relative to the brake lever housing; a fluid reservoir in fluid communication with the cylinder via a port that communicates hydraulic fluid therebetween, the fluid reservoir having a cylindrical shape and lying in a side by side relationship with the cylinder; and a diaphragm disposed within the fluid reservoir, the diaphragm including a substantial arrowhead shaped portion, the arrowhead shaped portion extending along a majority of the diaphragm, with the arrowhead shaped portion including at least two radial projections extending over an entire length of the arrowhead shaped portion.