I noticed movement in the hitch this weekend when taking off after I stopped. When I got home I unplugged the lights and backed up and no brakes. Coupler slid all the way back as well. Checked the fluid and its pretty much full. Do I need to bleed the system or does something need to be replaced? Also what is the proper procedure for bleeding the brakes? This is on a 2012 tandem axle trailer. Thanks Sent from my SAMSUNG-SM-G935A using Tapatalk