Abstract: A brake actuator for electrically actuated vehicle brakes includes a spindle assembly without additional gear stages. The forces required for engaging the brake are realized herein by utilizing the spindle assembly. The brake actuator includes a brake pad which is pressed against a brake disc with the aid of an electric motor (4) operating as an electric drive. A planetary-roller spindle assembly operatively connects the electric motor to a brake piston on which the brake pad is mounted. The electric motor (4) is connected via the spindle assembly to the brake piston (32). The spindle assembly (16) is arranged in the displacement direction of the brake pad and the brake piston (32) is journalled so as to be axially displaceable with the brake pad. The spindle assembly (16) includes a spindle rod (18) which is mounted so as to be an extension of the rotor (8) of the electric motor (4).