I have one tire that, when I put the vehicle into gear, will start turning then brake without touching the brake. When I push and release the brakes it reacts the same as the other side. So it seems that when I release the brake it disengages, then slowly starts to apply itself.
Any recent brake work done or 4 wheeling? Removal and inspection of components may be necessary to diagnose the exact cause for this issue. Double check any recent work. If this is after new pads and rotors it may take some time for the components to wear in.
Something for you to do as a test. with the vehicle supported off the ground and the transmission in neutral, have someone apply the brake and let off as normal while YOU spin the tire by hand.