Suggestions elsewhere so far were :
Wheel bearings? Look for interference between the caliper/bracket and the inside of the wheel.
I was thinking half shafts, but it really doesn't have enough miles to be that...
I'm not sure even the names of the parts but as mentioned the rubber boots...
Pads and rotors are good. I just took the wheel off and re lubed where I should behind the pads, where the tabs of the pads sit the clips, and the two slide pins in the rubber boots slide freely and re-lubed. I've replaced pads and rotors on like 10 different cars total of like 15 times never...