Earlier, nyffeler wrote:

Slightliy of topic, but important.

NEVER use automotive brake fluid for the brakes in gliders!
Automotive brake fluid will destroy the seals.

Except, of course, in those rare but not non-existant cases where the
brakes were designed around automotive pistons and seals. A good
example is the early (pre-MATCO) Rosenhan drum units used on some 1960s
American gliders.