After turning on the power supply, turn the knob to listen to the sound of the rear wheel. If there is noise, check whether there is an adjusting screw on the rear brake, and turn the screw half a turn until there is no noise.

This kind of brand of electric vehicle is a miscellaneous brand borrowed from motorcycle brand, which is generally a brand without trademark. Buying electric car brands will not cause this problem, such as Yoohoo, Xingyueshen and other electric car brands are cheap and good cars.