How to solve if Mi Electric Scooter cannot brake?

Under the boot state, people do not stand on the car, push the vehicle to lift the front wheel, press the accelerator to accelerate, at this time the front wheel is rotating, grasp the brake, if the front wheel can brake, this shows that there is no problem with the electronic brake. The electronic brake has the question may contact the Mi customer service to repair, inspected by the professional engineer. In the case of not turn on, hold on to the brake handle, if the rear wheel cannot be braked, then need to adjust the brake line and disc brake seat, adjust more than a few times to find the right position (pull the brake line, turn the rear tire, make disc brake seat close to disc brake disc, avoid rotating rear wheel to have the scraping sound).