To refill brake fluid for an Boyueda electric scooter, follow these steps:
First, unscrew the cap on the brake fluid port. Inside, you will find two washers—one silicone and one metal- not lose them. Next, attach the filler nozzle securely to the brake fluid port.
Then, repeatedly squeeze the brake lever; the brake fluid will gradually flow into the system. If air bubbles appear and prevent the fluid from entering, slightly loosen the nozzle to let the bubbles escape, then tighten it again. This will allow the fluid to flow in smoothly and complete the refill.
