How to solve the problem that the rear wheel of an electric bicycle spins heavily?

The rear wheel of an electric bicycle spins very heavily, mostly because the brakes on the rear wheel are not adjusted well. First adjust the length of the brake line appropriately. If it is still very heavy at this time, adjust the green screw next to it. You can turn it left or right. Its function is to keep the brake shoe in the middle position and maintain an equal gap between the shoe and the brake pot.
Adjust it repeatedly and turn the rear wheel by hand until there is a little bit with the smallest friction sound. At this time, it is adjusted. You can try it yourself. If you can't adjust it well, you can only ask a professional to help you adjust it.
Maintenance:
1. Brake pad replacement. Usually we use whether the brake warning light on the dashboard lights up as the basis for judging whether the brake shoes should be replaced, but this is the final bottom line. Therefore, it is necessary to check whether the brake pads are usable every time you enter the factory for maintenance, and replace the brake pads that are close to the bottom line of life as early as possible.
2. Routine maintenance of brake system. Clean, high-quality brake fluid is fundamental to safety and good brake system performance. You should buy better quality brake fluid on the market. All drained brake fluid should be discarded.