A friction disk comprising: a friction disk core comprising: a spine comprising a first contact surface of the spine that defines a first contact surface plane; and a first retention ring comprising an annular feature, the first retention ring disposed substantially concentrically with the friction disk core and extending axially relative to the first contact surface plane, characterised in that the first retention ring comprises an angled first retention ring wall that defines a first centration surface, and the angled first retention ring wall is not substantially parallel to a friction disk core axis; and in that the friction disk further comprises a first floating wear liner, being a wear liner configured to rotate with respect to the friction disk core comprising: a first primary wear surface configured to contact the first contact surface; a second primary wear surface opposite the first primary wear surface; an interior wall; and an exterior wall; wherein the interior wall and the exterior wall extend between the first wear primary surface and the second primary wear surface, and wherein one of the interior wall and the exterior wall is configured to contact the first centration surface. a friction disk core comprising: a spine comprising a first contact surface of the spine that defines a first contact surface plane; and a first retention ring comprising an annular feature, the first retention ring disposed substantially concentrically with the friction disk core and extending axially relative to the first contact surface plane, characterised in that the first retention ring comprises an angled first retention ring wall that defines a first centration surface, and the angled first retention ring wall is not substantially parallel to a friction disk core axis; and in that the friction disk further comprises a first floating wear liner, being a wear liner configured to rotate with respect to the friction disk core comprising: a first primary wear surface configured to contact the first contact surface; a second primary wear surface opposite the first primary wear surface; an interior wall; and an exterior wall; a spine comprising a first contact surface of the spine that defines a first contact surface plane; and a first retention ring comprising an annular feature, the first retention ring disposed substantially concentrically with the friction disk core and extending axially relative to the first contact surface plane, characterised in that the first retention ring comprises an angled first retention ring wall that defines a first centration surface, and the angled first retention ring wall is not substantially parallel to a friction disk core axis; and in that the friction disk further comprises a first floating wear liner, being a wear liner configured to rotate with respect to the friction disk core comprising: a first primary wear surface configured to contact the first contact surface; a second primary wear surface opposite the first primary wear surface; an interior wall; and an exterior wall; a first primary wear surface configured to contact the first contact surface; a second primary wear surface opposite the first primary wear surface; an interior wall; and an exterior wall; wherein the interior wall and the exterior wall extend between the first wear primary surface and the second primary wear surface, and wherein one of the interior wall and the exterior wall is configured to contact the first centration surface.