brakes sticking on one side

Hello
im new to land rovers but have bought a discovery 1995 mechanically it seem fine but the passenger side front brake sticks a little when braking but then releases, ive had the car about 3 weeks and this problem started a week ago, it feels like you have a flat tyre and pulls to he left for about 10 secs then releases, i have checked the caliper and the pistons seem clean and with the pads removed they can be pushed in by hand and the other piston will move out so they dont seem to be sticking
help it doing my head in
neil

sorted it replaced the flexible hose , used to have this problem with minis the inside of the hose expands so it doesnt release the fluid quick enough
simple really when you think about it , the disco is playing with my mind