Squealing while turning
 

Hey,
I have just bought a used 2013 GT86 with 68000 km on the counter.
Im was bothered with alot of squealing from the brakes, both when driving and turning, so I took off all the brake pads and put copper grease on all. This took away the brake squeal, but its still some squealing while driving normally and not braking at all :/
I dont hear anything while driving straight ahead, but when i turn slightly in moderate speeds it squeals. Its not that loud, I have to open the windows to hear it.

The guy I bought it from said it came from the hand brake, and that I had to loosen it a few steps. I've tried to drive a bit with the hand brake on to "set" the pads, but it doesnt make any difference.

What can this be? What can i check? Can it be the hand brake thing?
Thinking about just handing it over to Toyota and ask them to fix it..