A brake piston is described. The brake piston is configured for use in a disk brake system, the piston comprising: a body having an outside width perpendicular to a central axis; a footing disposed at a distal end of the piston; wherein the footing is configured to exert force on a brake pad during actuation of the disk brake system; the footing having a face configured to contact the brake pad, the face having a length and a width, wherein the length is longer than the outside width of the body, and the length is greater than the width.

Brake discs, systems, and methods may include a brake disc and a brake drum. In various embodiments, the brake disc includes a central hub, configured to engage with an axial shaft. The brake disc includes protrusions, each of which is coupled to the central hub and extends perpendicularly from the central hub. The brake disc includes expansion components, each of which is coupled to the central hub at two locations. Each expansion component surrounds an outer periphery of one of the protrusions. The expansion components define a segmented periphery configured as a braking surface. The brake drum is configured to have an inner diameter that is larger than an outer diameter of the brake disc. The outer diameter of the brake disc is defined by the segmented periphery, such that an inner surface of the brake drum is concentric around the segmented periphery of the brake disc.

A bicycle disc brake rotor is provided that has a center rotational axis, and basically includes an outer portion and a cooling fin. The outer portion includes a first braking part defining a first braking surface and a second braking part defining a second braking surface. The first and second braking surfaces face in opposite axial directions. The cooling fin includes an inner portion radially offset from the first and second braking surfaces. The cooling fin further includes an attachment portion extending outwardly from the inner portion and sandwiched between the first and second braking parts. The first and second braking parts are separate and distinct individual parts from each other and from the cooling fin.