A new brush can perform badly if it is the wrong revision, seated incorrectly or missing an end fitting. Check compatibility before assuming the replacement needs breaking in.

A robot’s round body may leave a strip beneath cabinet overhangs. Measure the recess and compare practical reach rather than assuming an extending arm reaches every edge.

Sudden loss of pickup is often about restricted airflow rather than a changed motor rating. Work along the short path from the floor opening to the bin and filter.

Door tracks can collect grit in channels the robot cannot reach well. Treat robotic cleaning as maintenance of the surrounding floor, with the track cleaned separately.

Vibrating pads and rotating discs provide powered agitation in different ways. A specification describes the mechanism, while actual stain removal still depends on pressure, water, passes and pad condition.