Am 30.03.2011 18:00, Annemarie Hollestelle wrote:
On Mar 28, 10:46 pm, John Sullivan
wrote:
I too have experienced the problem you are having with my
Ventus which was manufactured in 2004. It took me a long
time to figure out what was wrong. Eventually I simply
worked my way through the system to discover that
everything free as it should be except for the master cylinder
plunger which was frozen in the body of the housing. I
removed the unit, withdrew the actuating plunger, cleaned it
and then put silicone grease on it. That was the fix! Now I
will grease it every year at the annual

John Sullivan, UFO

Please be advised that the European glider manufacturers use DOT4
(yellow) "car" brake fluid in their disc brake systems. If you use
the(red) "aviation" type mill spec. brake fluid in these systems all
your "O" rings will swell and your brake system will be seized !
Please check with the glider manufacturer before you add the wrong
fluid!
Ed Hollestelle, A1


Be careful, this is not true for all European gliders. E.g. my
Schleicher ASW24 uses Aeroshell Fluid 4, which is bases on mineral oil.
Using car brake fluid would ruin the system. The difference lies in
where the brake system comes from:

Aircraft brake system (Cleveland): mineral oil based fluid
Motorcycle brake system: DOT... car brake fluid

--
Peter Scholz
ASW24 JE