You can bench-bleed your master cylinder using brake hydraulic lines or by purchasing a master cylinder bench bleeding kit from a local auto parts store.

Bench bleeding the master cylinder eliminates any air pockets in the system so that the fluid flows properly. If the master cylinder isn’t bled properly, the entire brake system suffers.

With one side of the master cylinder plugged, it is time to bench bleed the master cylinder using the supplied bench bleeding kit. There are actually two ways to do this.