Put a little bit of lithium grease on that frontshoe 'pivot' (that looks as if it has a hex head) where the brake shoe ends will ride on it.
If you get spring squeaking or vibrating sounds, BMW sells some rubber blocks that can be fitted on the springs to quiet them - these may or may not work for you, if needed. Some folks put some rubber inner tube or some heat srink tubing to dampen the springs, or go without. I run my LS without any rubbers on her brake shoe springs and no noise issues yet.