Spreader unit for a motor vehicle drum brake

A spreader unit for a drum brake, comprising:

• a housing;
• a first and second brake shoe holders that are rotationally secured to the housing, and actuatable linearly along an axis, respectively away from one another in a spreading direction and respectively toward one another in a release direction;
• a first and a second brake shoe provided respectively with a brake lining;
• a readjustment device arranged between the actuating pistons, wherein the readjustment device changes the spacing of the actuating pistons in at least one readjustment step when an actuating travel of the first and second brake shoe holders has exceeded a travel setpoint value;
• and
• a thermally actuable blocking device mechanically prevents the execution of the readjustment step by the readjustment device at a temperature above a temperature setpoint value.

A spreader unit for a drum brake comprising:

• a housing;
• a first and second brake shoe holders that are rotationally secured to the housing, and actuatable linearly along an axis, respectively away from one another in a spreading direction and respectively toward one another in a release direction;
• a first and a second brake shoe provided respectively with a brake lining, having at least one rotation-translation converter mechanism;
• a readjustment device arranged between the actuating pistons, wherein the readjustment device changes the spacing of the actuating pistons in at least one readjustment step when an actuating travel of the first and second brake shoe holders has exceeded a travel setpoint value;
• and
• a thermally actuable blocking device which mechanically prevents the execution of the readjustment step by the readjustment device at a temperature above a temperature setpoint value.