brake calipers

Have had a barely-worn Pagid rear inner brake pad split from its backing plate - all the friction material fell off in one piece. The caliper piston is, from the look of it, fully-extended, with just the backing plate in front of it. I can fairly easily rotate the piston clockwise, but it...

Hello all! I've have recently bought a 2001 1.2TDI and apparently the front discs and pads need to be replaced. Now, it has done over 220 000 km and I was thinking do the calipers need changing as well? They are made from aluminium, right? So do they hold up better or worse than regular steel...