Rear Brake refurb

[fazersharp]

If you've not got piston pliers, be sure to leave enough of the second piston proud of the caliper body that you can grip it.  These pistons are quite long and you need to push which ever one you're not taking out back into the body, just make sure you do as above or you'll have to get hold of piston pliers to remove it.
Push them both out with a single pad between them, get them a equal as possible, now clean the pistons ensure you get to the undersides, grease them and push them back.  This will help free them, it will also give you an indication if they're seized, from there you can decide to split or not.
As mentioned these are often a real pain to remove and they can lock themselves in, I've had many an owner turn up with a caliper body with chewed up seized pistons. :wall
If your's have been well maintained your should be ok, good luck.   

Thanks for your help.
Will be getting some piston pliers. I wouldn't say the rear caliper has been "well looked after" other than keeping is clean but doesn't really get dirty.So before I take off completely I will use the pedal to push them out to grease them. Are they long enough to push out until they touch each other or maybe a thin piece of metal in-between so I can use it to push them apart after greasing.Thinking if I buy the set with new pistons and mine are ok I could sell the new pistons on their own.