If your fluid is gone youŽll have to bleed. First of all you need one thing like this:
http://www.pocketbikeplanet.com/gall...0&ppuser=15146
You want the bigger syringe you can find. They are used to feed new born pets. You need some tube, the same size used to feed cagŽs carbs will be fine. YouŽll need an empty cup or something to bleed the fluid to. YouŽll need a small wrench to open/close the bleeding screw. YouŽll need some duct tape or a friend to help you. YouŽll need DOT4 brake fluid, any brand (be careful with brake fluid as it eats it all)
Here we go, fit the tube to the bleeding screw. Open the reservoir and take out the rubber seal. Fill the syringe with fluid and fit it to the tube you previously fitted to the bleeding screw. Press the syringe to fill the system with brand new fluid, be careful and do it slowly, checking reservoirŽs level. Using a syringe and forcing the fluid through systems lower part will help to keep as less air bubbles as possible, less air youŽll have to bleed later

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Once you have filled the system close the bleeding screw. Now its time to bleed the brake.
To bleed the brake you take out the syringe from the tube and leave the tube attached to the closed bleeding screw. Pump the lever with your hand till you feel some pressure, use the duct tape to keep the lever pressed. Open the bleeding screw, youŽll see that some fluid drains and youŽll see some air bubbles too. When the bubbles stream stops, close the bleeding screw. Cut the duct tape and pump the lever again till you feel some pressure, leave it pressed using duct tape and repeat the bleeding routine till you see that no air bubbles come from the screw. From time to time check reservoirŽs level, as youŽll have to fill it.
Once you have bleeded all the air, fill the reservoir to its marked level, place the rubber seal and close the cap. Pump the lever again, when you can feel the pressure duct tape the lever and leave it that way overnight. YouŽre done