says, I have never thought about it this way before, because I have always assumed that a spring memory will automatically close when the operating brake loses the air… how is that? for example: I saddle my trailer off and only take off the air hoses (the cables of course also, but of course do not play a role here) and leave the trailer standing. the brakes are automatically closed… how is that now, if my operating brake but the druc k loses?? the brake goes up and my trailer makes itself independent?? thank you alreadyma