Hydraulic Brake Master Cylinder

A hydraulic brake master cylinder for a bicycle or off-road vehicle having a handlebar wherein:

• the hydraulic brake master cylinder has a reservoir partially formed around the handlebar.

A hydraulic brake master cylinder for a bicycle or off-road vehicle having a gear shift wherein:

• the hydraulic brake master cylinder has a reservoir with a reservoir cover;
• and
• the reservoir cover has a concave portion to provide clearance for the operation of the gear shift.

A hydraulic brake master cylinder having:

• a reservoir containing a reservoir fluid volume and a reservoir expansion volume, wherein the reservoir expansion volume has an air volume of at least 2.5 cc.

A hydraulic brake master cylinder having a reservoir containing a reservoir fluid volume and a reservoir expansion volume, wherein the ratio of reservoir expansion volume to reservoir fluid volume is at least 1.8.

A hydraulic brake master cylinder for a bicycle or off-road vehicle having a handlebar, wherein the hydraulic brake master cylinder has:

• a reservoir containing a reservoir fluid volume and a reservoir expansion volume;
• a reservoir cap;
• and at least one bleeder port wherein a bleeder port is located on the back side of the hydraulic brake master cylinder opposite the reservoir cap, near the handlebar, and in the reservoir fluid volume area.

A hydraulic master cylinder having:

• a bleeder screw with a tapered nose and a body bleeder port, wherein the tapered nose deforms material in the body bleeder port upon installation to create a low pressure seal.

A lever, having a finger contact area comprising an hourglass shape when viewed from the top.

A lever having a finger contact area with a perimeter, wherein there is a fillet around the perimeter of the finger contact area having an inside end and a tip, wherein the fillet tapers from a larger width at the inside end of the finger contact area to a smaller width at the tip.

A symmetrical cylindrical pivot pin with two ends, having concave grooves around its circumference near each of the two ends to accept a simple wire form clip.

A lever having an attachment end wherein the attachment end is split into two lever legs.