I have not adjusted mine but that was the remedy I read on the air force bake system that's what I have. Mine has stuck on a couple of times. I went and pressed the break pedal a few times . That took care of the problem. I would think the 4 hold the bracket and the single nut is the adjustment. Ill look at mine in a while and let you know how mine is held on. Sorry I cant give you the answer right now im at work.