I've noticed for a past couple of weeks I get a healthy clunk in my rear left wheel well. I've narrowed it down to a lose caliper that has a bit of up and down play in it.

However, when I replaced my pads over christmas the two 19mm bolts that hold the caliper in place went in without a problem. I even used blue threadlocker which is still holding the bolts because I couldn't get them to budge.

How in the world is it possible for two bolts to remain stationary yet somehow they moved or possibly got smaller?!

I'm lost.

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-Typos courtesy of my mobile phone.