A racing mate (runs his garage) brought this in today. A man came in (quite a while ago, as you can tell by the rust), and wanted the fluid replaced as there was none in it. Upon inspection, the mechanic noticed the pistons had fallen out and all the fluid peed out! The combined thickness of the existing pads (both) and the disc wasn't even thicker than the width of the new disc alone! Pads has also worn through to metal.