The purpose of these genuine Bosch brushes are to conduct electricity from the fixed parts of the motor through the moving parts of the motor.The symptoms of worn down carbon brushes:- No wash or spin action on your washing machine- Intermittent spins when on cycle- Large amounts of sparks coming out of the motor from the carbon brushesOver time carbon brushes can get worn down and will need to be replaced. Use this replacement carbon brush set to restore your washing machine motor back to working order. Please check model fit list to ensure this part is correct for your model.