Brushless motors solve the three classic limits of official LEGO motors: speed, torque, and durability. Stock Power Functions and Powered Up motors are brushed, so they are slow, struggle under heavy loads, and wear out over time. A brushless motor removes those limits — builds can reach 30-60 km/h, climb and drift, and run for years without brush wear.

But brushless power is not a drop-in upgrade. It brings its own problems.

• The biggest one is overheating and burnout: when the wheels stall under load, current spikes and the motor cooks itself in seconds. Heavy models overheat within minutes, and removing a motor's thermistor makes burnout even more likely.
• Low voltage can also burn a motor, since it forces higher current. Voltage and connectors are another weak point — 3S LiPo melts thin LEGO Power Functions plugs, and a Buwizz 3.0 cannot sustain 11.4V and 3A under full throttle.
• Finally, high RPM punishes the drivetrain, causing skipped gears, broken CV joints, and vibration.