Mine were realy bad also, I asked toyota to check it out before they were replacing them. They managed to fix them for 2000km , then i gave up.
Now I just shove the garden hose into the brake caliper and around the pads every time i wash it. Wait till all the black dust come out, done, No more sqeeling brakes. its been good for a 6 months.
They still shudder like mad when warm and down hill. Maybe i should ask toyota now about a replacement set