iRobot Roomba Series Side Brush

iRobot Roomba Series Side Brush
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The iRobot Roomba 980 comes with one spare side brush. I have to change to the spare side brush after one of the brush head of the original broke.

After changing to the spare side brush and scheduling it to clean just once, all the three brush heads broke. It is probably due to hardening of the rubber of the brush head that makes it so brittle.