Problem solved!
I jacked up the rear on Friday evening and got underneath with a flashlight to have a look. As it turns out, the main brake line on the passenger side seems to be twisted, forming a curly-q on its way to the caliper. Unfortunately, this was causing the brake line to rub the inside of the wheel when I would depress the brake pedal.
I have no idea how long this has been like this, but with the tires just getting refinished and new tires getting put on, they added a new wheel-weight to the inner edge of the wheel. I guess when I would depress the brake pedal, it would cause the brake line to flex and push against the wheel-weight, creating the knocking noise.
I zip tied the brake line for now, but I think at some point I should probably untwist it for a more permanent solution. The outer jacket of the brake line does have a small knick in it, so I'm wondering if it needs to be replaced now that it has been compromised. Does anybody have any thoughts on this?
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