I have a 5303 tractor that the brakes are dragging. I have free play, and the brakes work, but it seems that there is a parking brake (which there is none) partially on. When I push in the clutch, tractor stops slowly, as the brakes are dragging. I recently changed the hydraulic fluid after cleaning the filter under the PTO. I used Super 303 fluid from tractor supply. John Deere service mgr told me that would cause the discs to swell and the retainers to drag. I drained the fluid again and replaced it with John Deere fluid, but has not improved issue. Any ideas would be appreciated. Also how to bleed the brakes.