Who can help me here,have this trailer,which used to be a truck for a good 15 years,now I played with the idea to install a brake and had to notice that in the brake drum no brake shaft goes but only right and left each one a line, so I guess that vehicle had hydraulic brakes,how did the hand brake work?There is nothing else in the drum!I post a few pictures,somebody has an idea! W” yes shock absorber can have done only something small in the range up to max 7.5t?!