Enhanced Cleaning Power: Old brushes tend to get tangled in hair and build up dust, so replacing them restores strong suction power for deep cleaning of floor stains. Protects floors: Worn out brushes can scratch floors, so the replacement brushes conform to the flooring material and minimize friction damage. Reduce Noise: Stuck old brushes can increase operating noise. Replacing the old brushes with new brushes will make the machine run more quietly and smoothly. Extend the life of the machine: poorly rotating brushes add to the burden of the motor, replacing them in time reduces internal wear and tear and extends the life of the vacuum cleaner.