On the first pic, taken of the front pads, are these the pistons from the calipers? Mine were stuck to the pads. Is that normal? Should I reuse them or get new pistons?

On the second pic, what metal part is the arrow pointing to? Do I need to keep that and reuse or is that a part of the pad that can be thrown away?

Thanks.

 

There piston guides. You can simple peal/pry them off with a small flathead screw driver and reuse them no your new pads.

 

So its not the piston right? Should I replace the rubber dust seal? And is there a piston in there too?

 

They're called vibration dampers. The little one's are on the rear pads and are different sizes, 28 and 30mm. Some people have reported not using them at all without issues, others have reused the existing one's, putting new adhesive on the back.

 

what kind of adhesive should be used?

 

Go to the RennTech DIY article that will talk about this subject:

http://www.renntech.org/forums/index.php?showtopic=7065

 

They come with a pre-applied adhesive. You should not have to re-apply anything if reusing them. I've gone without them and do not notice a problem.