Robot vacuum leaves streaks of dust or lines of debris behind it, especially on hard floors.

Safety first: Turn off the robot and place it upside down.

• Inspect main brush: Check for worn, flattened, or missing bristles. Replace the main brush if worn.
• Check brush seating: Ensure the brush is fully inserted into its drive socket and the opposite end is properly supported.
• Inspect brush guard: Make sure the brush guard clicks into place and its rubber lips are intact to help channel debris.
• Check wheel height: If wheels are excessively worn or loose, the robot may ride too high. Replace worn drive wheel modules as needed.