Rear Caliper braket loose
First time posting, long time lurking. I'm in the process of rebuilding an 08 V I inherited recently and its almost done (pics coming soon). I've done all the work myself from end to end, except tire change. I figured while I'm having the tires changed, I'll ask the mechanic to change both sprockets and change the chain as well.
Today, I noticed when I slam on the rear brakes, I hear a banging noise. After inspection I noticed its the rear caliper bracket which the 2 rear caliper bolts attach to. The bracket moves front to back, but not side to side. The caliper bolts are tight per spec and caliper does not seem to be the culprit. I don't remember hearing this prior to visiting this mechanic. Before I call him can you direct me please. Is it a spacer, pin or anything that he could have missed. Thanks in advance.