i too had the same affliction! although been an old disco, the rear pad had slipped onto the disc flange, not only creating a 4mm deep grrove, but at the same time seizing up 2 (inside) sliders, and blessing me with a bit of play in the nearside wheelbearing!
...add to that the rear brake pipe that looked a bit damp.. a week later it was positively wet, and of course that wasnt straight forward either, the bleed nipples were corrode and siezed, and the end sheared in the t-piece.....
2 pipes and a new t-piece later brakes still dont feel 100%, although the front pads are next on the priority list.
dont you just love landrovers?!