Brake wear detection

Elevator brake (20) for braking rotation of a rotatable shaft (12) in an elevator drive system (5), the shaft (12) extending in an axial direction (A) and being rotatable around an axis of rotation (Z), the elevator brake (20) comprising:

• a brake disc (24) mounted to the shaft (12) such as to rotate concurrently with the shaft (12);
• at least one movable plunger (30) that is linearly movable along the axial direction (A) between an engaged position, in which it engages the elevator brake (20), and a released position, in which it releases the elevator brake (20);
• an actuator that is configured for selectively moving the at least one movable plunger (30) between the engaged position and the released position;
• and
• a blocking mechanism (32, 36;
• 46a, 46b) that is configured for preventing the at least one movable plunger (30) from moving from the engaged position into the released position if the at least one movable plunger (30) has traveled more than a predefined distance from the released position into the engaged position.