If your brushes are wearing down quickly and coming off, then it is likely that the brushes are set too low or that the grass is too high. For best use, we recommend setting the brushes 1-2” off of the ground. If your grass is 3 inches or taller this may impact the efficiency of the sweeper brushes. However, this depends on what you are attempting to sweep. Please refer to the setting sticker on your unit to accurately place your brush arms.