Patent ID: 8453803

Claim:
A brake actuating apparatus, comprising: a caliper body comprising a cylinder, which comprises at least one fluid-contacting surface, a first end and a second end; a piston movably engaged with the cylinder at the first end, the piston comprising at least one fluid-contacting surface; a shaft rotatable about an axis; a plug comprising a body fixed to the cylinder at the second end, the plug comprising at least one fluid-contacting surface; a head connected to the shaft at a distance from the axis, the head being at least partially rotatable about the axis relative to the plug as the shaft rotates about the axis, the head comprising at least one fluid-contacting surface; a head receiver being a configuration formed in the body of the plug and comprising at least one fluid-contacting surface, which is other than the at least one fluid-contacting surface of the plug, the head receiver being configured to receive and liquid tightly engaged with at least part of the head, and further configured to guide rotational movement of the head relative to the plug; brake fluid filled in a space defined by the at least one fluid-contacting surface of the cylinder, the at least one fluid-contacting surface of the piston, the at least one fluid-contacting surface of the plug, the at least one fluid-contacting surface of the head receiver, and the at least one fluid-contacting surface of the head; wherein at least partial rotation of the head about the axis relative to the plug is to cause a change in a shape of the space while substantially maintaining a volume of the space, which further causes a linear movement of the piston along the axis relative to the cylinder, wherein at least partial rotation of the head about the axis in a first rotational direction relative to the plug involves at least partial rotation of the at least one fluid-contacting surface of the head about the axis in the first rotational direction, wherein the at least partial rotation of the head does not involve linear movement of the head along the axis relative to the plug.