Brake apparatus with single shoe

A brake apparatus comprising:

• a single monolithic brake shoe having a circular shape, wherein the shoe has a spacing defined therein at a first location thereof;
• and
• an actuator disposed in the spacing, wherein the actuator includes a hollow cylinder and a piston slidably contained in the cylinder, wherein when the actuator is activated, the spacing increases;
• wherein the brake shoe has an actuation-force reducing groove defined therein at a second location thereof, wherein the groove is defined in an inner face of the shoe facing the spacing, wherein the first location is opposite to the second location.

The apparatus of claim ii, wherein the parking lever includes a first actuation link and a second actuation link,

• wherein the first actuation link has a predetermined length along a horizontal direction and has one end inserted into the accommodation groove,
• wherein the second actuation link has a predetermined length along a vertical direction, wherein the second link extends perpendicular to the first actuation link,
• wherein one end of the second link is operably engaged with the other end of the first link, wherein said one end of the second link is received in the reaction-force generation groove,
• wherein in an operation of the apparatus as a parking brake, the second link pivots around the other end thereof, thereby pressing the first actuation link, thereby increasing the spacing between the first piston and the second piston.