Adding ASW-24 Brake Fluid

I am trying to fill the brake fluid reservoir of my ASW-24, but with no luck.

I am following the Schleicher Maintenance Manual procedure. It has you adding the fluid into the bleed valve of the caliper.

First you have to attach a funnel to a 6 ft length of instrument tubing. The tubing is attached to the nipple of the bleed valve. The funnel is held about 6 ft high. You then add the hydraulic fluid to the funnel and then open the bleed valve. The head pressure of the fluid in the funnel/tubing is suppose to drive the fluid up through the system into the hydraulic fluid reservoir.

The problem is that even after opening the bleed value no fluid moved into the reservoir. I even added vacuum pressure to the vent of the reservoir to try and draw the fluid into the reservoir, but that did not help.

Does anyone have suggestions?

Thanks,

Lauren Rezac
5YA