Why can't the Xiaomi Robot Vacuum S40 climb slopes it used to?

After a period of use, the drive wheels of the Xiaomi Robot Vacuum S40 will be covered with a lot of dust and dirt, which will affect the obstacle crossing and climbing ability of the device. It is recommended to clean the dust and dirt on the surface of the drive wheel with a brush once a week.
For your reference, here are more benefits of cleaning drive wheels of the robot vacuum:
1. Regular cleaning removes debris that reduces friction and grip, helping the robot vacuum regain its original ability to climb slopes and cross thresholds;
2. Dust buildup increases resistance on the wheels, making the motors work harder. This can lead to premature wear. Cleaning helps preserve motor lifespan and mechanical efficiency;
3. Dirty wheels can slip or spin unevenly, affecting the robot vacuum’s navigation system. Keeping them clean ensures better path tracking and avoids getting stuck or veering off course;
4. Accumulated dirt can cause grinding or squeaking sounds during movement. Cleaning the wheels helps maintain quiet operation.