Abstract: An electric brake comprises an actuator module including a module housing, a reciprocating ram, and an electric motor operatively connected to the reciprocating ram for selectively extending and retracting the reciprocating ram with respect to the module housing. The ram has an inner portion of non-circular cross-section and an outer portion of circular cross-sectional, and the housing has a guideway for the ram, which guideway has an inner portion of non-circular cross-section for interacting with the inner portion of the ram to prevent rotation of the inner portion of the ram, and an outer portion of circular cross-sectional. The actuator module can be equipped with a bi-stable holding brake having a first state permitting at least retraction of the ram and a second state preventing at least retraction of the ram.

Abstract: An electric brake assembly and method are characterized by a brake disk stack (12) and an actuator assembly (11) for applying braking force to the brake disk stack, the actuator assembly including an actuator mounting member (18), and at least one actuator module (27) removably mounted to the actuator mounting member, each actuator module including an electric motor (80) and a ram (26) carried by a respective housing (34), the housing of each actuator module having at least one mounting flange (36) for abutting an axially outwardly facing mounting surface on the actuator mounting member when in a first rotated position within an aperture (42) in the actuator mounting member, and the mounting flange having a configuration for axial passage through the aperture when in a second rotated position, thereby to facilitate easy disassembly of the actuator module from the mounting member.