Signs of a Worn Pool Robot Brush

A brush can look bad and still be fine. It might just be caked with dirt. Or it might be worn and need replacing. Rule out the easy causes first.

Start with the setup

• Unplug the unit and lift it out of the pool. One manual-style guide says to "Remove the cleaner from the pool, power off, and place it on a flat surface"¹.
• Rinse the brush and the filter. A clogged filter cuts suction and cleaning, and one retailer FAQ calls it the most common cause of reduced suction²³.
• Run the robot again. If the cleaning improves, the brush wasn't the problem.

Signs that it's worn, not dirty

• Short bristles or low rubber. On bristle brushes, "As bristles wear, they shorten"¹. If you have a spare or a new part to compare with, hold them side by side.
• Weaker scrubbing. A maker says worn brushes scrub walls and the waterline less well². Watch for a film left along the waterline, and for dirt the robot used to lift.
• Cracks or stretching. One FAQ says to look for "signs of wear, cracks, or stretching"³.
• Stiff or brittle feel. Sun and chemicals age rubber and plastic, so a brush that has lost its give is worth a second look. Your manual may say more.

Signs that it's loose or broken

• A segment hangs off. On clip-on designs, "A segment that has unclipped from the carrier bar will drag behind the cleaner or foul the tracks"¹. Press it back in only as your manual shows.
• Missing pieces. For segmented brushes, one guide says to "Count the segments and compare to the model's specified count"¹.

Signs it's something else

• The robot moves fine but the water stays dull. Check the filter and the impeller first³.
• The robot slips or drifts. That points to the tracks. The track and wheel checks come next.
• Strange noises. Don't blame the brush. See drive motor basics.

One guide warns that brush problems and drive problems "can look similar from the outside but require completely different repairs"¹.

When to replace it

• Replace a brush that's clearly short, cracked or stretched, using a part that matches your model. Part-matching steps are on their own page about replacement parts.
• Follow your manual's steps for your own model. Don't force anything.
• If a brush looks fine and the cleaning is still poor, talk to the maker's support line before buying parts.
• Keep the old brush until the new one is fitted and the robot has run well. It's your best guide to the right size.
• Look at the brushes again at the start and end of the season, not only when something goes wrong.