I noticed the only info for this is a link to Spyder Chat so I made a record when replacing mine, if it’s any use you can use it
While having my tyres replaced I noticed the rear discs & pads were getting worn/corroded and as the MOT is due next month I thought it best to replace them to give time for bedding in.
Here again is a picture record of how it was done (showing rust and all) using tools not necessarily recommended by the manufacturer
REMOVE SLIDER BOLT (12mm RING SPANNER)
ONCE BOLT IS REMOVED
PIVOT UP THE PISTON ASSEMBLY AND SLIDE OFF TOP PIN (This can be a little awkward but it is doable)