Motorcycle Disc Brake Oil Pipe Refueling Needle Cylinder Exhaust Electric Vehicle Maintenance Up and Down Pump Exhaust Air Injection Brake Oil Tool

1. Remove the lower pump bleeder screws, screw on the new bleeder screws, syringe the pump to take all the brake fluid pumped out, brake fluid pumped out after using a syringe to inject air into the lower pump 1-2 times to make the oil light and the upper and lower pump to keep clean.
2. Make sure the upper pump is normal and the lower pump piston is normal.
3. Add 50 ml of brake fluid into the syringe, slowly inject into the brake fluid, at this time to observe the upper pump oil box out of the oil with or without air bubbles, such as air bubbles pumped back to the brake fluid, continue to inject until the oil box and no air bubbles so far.
4. When the upper pump oil box is full, tighten the lower pump bleeder screw.
5. Repeatedly pinch the brake handle until the brake is normal.