The brake adjustment for all NANROBOT D4+ 2.0 scooters is nearly identical to the process shown in this video:

The key differences between the scooter shown in the video (D6+) and the D4+2.0 is that the front caliper is mounted vertically on the D4+, while it is relatively horizontal on the D6+. Besides that, the brakes can be adjusted in the same way.