Hi,
I am enclosing a link to a recent photo of a drum brake system which was used by one of the visiting italian jet team flying a large AIRWORLD version of the L-39.
This is just an add-on to the type of air brake systems quoted above.
http://www.rcuniverse.com/forum/upfi...94/Lf95158.jpg
It is highly likely that this system is manufactured by someone in Europe. Unfortunately, I am not aware of the name of the manufacturer.
Regards
Reuben