Maintaining the brushes is important
Polyethelene brushes last 10,000 to 15,000 washes or 5 years; once the cruciform wears out, the strand loses lubricity. A simple test of brush replacement is to measure existing from shaft to ends. A new brush is 16” long. Flagged ends offer a better finish for the final clean. Short brushes cause strain & stress on the motor or gearbox, leading to possible burn-out.