My drivers caliper is smacking on the bracket it's held onto and causing a loud clunk.
I've watched that video quite a few times and I'm still trying to figure it out
At first, I thought the clearance b/t the caliper and the abutments (on the knuckle) which the caliper presses against during braking was excessive. The abutments are fore and aft of the caliper and hold it in position against braking (and other dynamic) forces.
But after watching more, I noticed the caliper bolt (in the foreground of the video) almost seems like it's not affixed in the knuckle... almost like that bolt is broken, and allows excessive caliper movement relative to the knuckle. Hmm... that can't be, can it?
Other thoughts / comments:
I once shimmed that gap (caliper to abutment) simply to mitigate rattling on bumps (bumps caused the caliper to impact against the abutment), but on a different vehicle. You might try sticking a piece of sheetmetal into that gap and try the same experiment, just to see if the noise abates.
Is that an aftermarket knuckle?
Do those ball joints have the proper taper and depth for those knuckles?
Your camera is evidently mounted on the lower control arm. It's interesting how much the control arms move, even under the light braking situation in the video.