It was just the brake pads on the rear axle.
When I took it in on wednesday they thought it was a leak on the rear axle (something was leaking grease, they thought) but after closer examination it was just the rear brake pads that were worn.
In retrospect it must’ve been the front axles where I replaced the brakes, not the rear. What I don’t get is why did it squeal when I drove it at 10mph w/o touching the brakes?
So its only $89.99 to fix. Yay me.