I just did my first rear brake job. Drove it right after I put it back together and it sounded perfect. Day after I drive to see a buddy and no problems. Then we pull out to get lunch and my rear passenger side wheel is clunking consistently from the get go. Much more noticeable noises at slower speeds and when we hit any kind of hole or raise on the road. The caliper is snug and all the bolts holding it in are secure. The sound is like a couple of big rocks banging together in a metal barrel rolling downhill. Not perfectly rhythmic but not random either.

What the heck did I do?