Check up the main cylinder and a tank on liquid leak. At leak detection, eliminate.
Check up liquid level.
If level below minimum, add if necessary. Fill in in a tank the brake liquid specified on a cover of a tank. For details Service out of a workshop in the Head Coupling see.
After coupling system have filled with a brake liquid on the basis of glycol on manufacturer, do not use and do not mix with other type of a liquid. Otherwise there can be serious damages. Do not use the old or used brake liquid, or the liquid taken from not sealed container.