Hello!
I have a similar problem with my Hyundai Tucson 2008, the rear left brake rotor is wearing only half an inch from its center. Another cause can be a clogged brake hose?
When I changed the brake fluid with a pressure/ vacuum pump, at the rear brake hoses the fluid was squirting very weak. at the same time on the front hoses the squirt was much powerful. this is normal behavior?