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A little forum wisdom wouldn't go amiss here....
Just replacing pads on old hope mono minis and one piston is a little sticky. What's the best lube to put round the piston if I get it almost all the way out?
Cheers folks
Best - IMO red rubber grease. Brake fluid will do.
Some oils can make the seals swell and stick more.
Brake fluid
Red rubber grease. Brilliant stuff, plus it's £5 for a tub from Frosts and it will never run out in your lifetime 
Crikey, feeling a bit ignorant here. What is Frosts? I googled it to no avail. Is it a shop of some kind, and is red rubber grease an actual product name?
Oh yeah and thanks for the help
Use brake fluid or silicone gun lubricant. Grease will infect the oil and give you a spongey feeling at the lever much quicker
Is it sticky or seized?
hope the brake fluid works but you might have to change the seals if not.
If you've got better things to do with your time hope do it for 35£ ish. Includes work, new seals, phenolic pistons, set of pads.
Sometimes wonder why i bother doing it myself, ah that's it, i like it.
This is the correct / best stuff but brake fluid will do Other manufacturers make it as well. It will not attack the seals or the brake fluid in any way
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hope is £40 + postage
this thread here has links to guide on doing full service Uk bike store cheapest for parts under £30 for all seals [inc lever] and 4 pistons
http://www.singletrackworld.com/forum/topic/servicing-hope-mono-mini-brakes
Use hunters silicone lubricant.
The piston is probably corroded. Pushing it back in will just force the corroded part past the seal, possibly damaging it.
Ideally, you should remove the piston and polish the outer surface.
Or fit phenolic pistons so it won't happen a gain.
If I was stripping it down, I'd use the earlier mentioned red rubber grease or silicone grease.
If I was just doing it in situ, I'd use brake fluid as it will easier get all around the piston etc.
Hope pistons suffer with crap build up rather than corrosion most of the time so a re-build is a bit of an over-kill every time it sticks
I tend to push them out [as far as I dare] one at a time, holding the other(s)back & applying brake fluid with a cotton bud or similar, push it back in & repeat a couple of times
do the same with the other piston(s)
Give it all a good clean with IPA or meths & stick the pads back in
Quicker to do than type up
I asked Hope this question and they said they use silcone grease which I got on eBay
Awesome responses thanks for all the help. Not corroded as far as I can see so just going for a quick clean, lube and new pads
Cheers