Motor-driven disk brake

A motor-driven disk brake having a caliper said caliper containing:

• a piston for pressing a brake pad;
• a rotary actuator;
• and
• a rotary-to-rectilinear motion converting mechanism for transmitting rotation of said rotary actuator to said piston after converting it into a rectilinear motion;
• wherein said piston is driven in response to rotation of said rotary actuator to press said brake pad against a disk rotor, thereby generating braking force;
• said motor-driven disk brake-further having a pad wear compensating mechanism for advancing said piston relative to a rectilinearly moving member in said rotary-to-rectilinear motion converting mechanism in accordance with wear of said brake pad, said pad wear compensating mechanism having a rotatable limiter engaged with a rotating member in said rotary-to-rectilinear motion converting mechanism with play in a direction of rotation;
• wherein a resilient member is provided between the rotating member in said rotary-to-rectilinear motion converting mechanism and the limiter in said pad wear compensating mechanism, said resilient member being adapted to generate a set load greater than a non-loaded-state rotational resistance of said rotating member and to store a torque in accordance with relative rotation between said rotating member and said limiter during braking.