When I got the axle I tore it completely apart to grease bearings etc. When I did that I debraked all of the parking brake stuff.
I can hear a slight squeal when starting to move. Before I pulled the residual valve, it would barely roll. It's hard to say how much is grabbing. I wheeled a few weeks ago on a nasty drainage and did a lot of tire spinning. Rig smelled brakes when I finally pulled cable.