Thought this might be worthwhile seeing as I spent so long trying to figure out how to do this . Probably a no brainer for more experienced people out there but if you have not done it before this might be usefull .
I'm only going to show how to get the dust boot on - the rest of the job of replacing the seal bleeding the brakes etc should already be 2nd nature to anyone attempting this .

Here is my damaged dust boot - this is the 3rd one i've had go like this - i'm putting it down to stones in the caliper but if anyone else has any ideas on it i'd like to hear them.
http://i154.photobucket.com/albums/s255/brettus_rx8/Image019.jpg

It's a good idea to put a plastic bag over the brake master cylinder before disconnecting any brake lines - stops the flow of oil by creating a vacuum in the reservoir

http://i154.photobucket.com/albums/s255/brettus_rx8/Image020.jpg

Pic below is the key to the proceedure - this is the only way you can get this boot on . Stretch the boot over the end of the piston and pull the boot forward so that the lip that locates in the caliper is at the top (of the picture shown)

Now you have to put that lip into the caliper - ease it into the area you cant get to first (the part obscured by the casting) . Then when the lip is in place all the way around - slide the piston into the caliper .

Here is my damaged dust boot - this is the 3rd one i've had go like this - i'm putting it down to stones in the caliper but if anyone else has any ideas on it i'd like to hear them.
http://i154.photobucket.com/albums/s255/brettus_rx8/Image019.jpg

Small tear in the boot and then get the brakes good and hot. Happened to me more than I would have liked at track days. Cause of the rips can be various.

Nic ethat is something for someone new to brake calipers to know