Since it involves turning, it might be a "squealer" on the disc pad, to warn you when it's getting worn too much. Also could be the tire itself squealing since one side has more pressure on road in a turn than the other side of the tire. Could be bearings in the hub. Just too many things without being able to hear it.
I have a weird problem with my Volvo v70 2001, 230000 miles.
There is a passenger side squeal, but only when I turn right and the AC is on. Obviously my first thought is that it is some sort of belt or pulley squeal. But, if I turn off the AC, centre the wheel or turn left it stops, which seems illogical.
It starts about twenty minutes into each journey and gets progressively worse, then vanishes the next day when the engine is cold.
I have a small power steering fluid leak and the fluid is a bit before the 'cold' line in the reservoir. I haven't checked the level when warm. It's it possible that an insufficient amount of fluid when warm is causing this somehow?
Any thoughts appreciated.