Having done this recently too I'd like to add the following comments:-

1) If you split the caliper you will have trouble finding new o rings
2) I was taught (as an aircraft mechanic) to never clean any rubber parts with Acetone as this has the same effect as trichloroethane - it deteriorates rubber parts (Don't believe me? Do an internet search for "acetone rubber")
3) I think the most important aspect of resealing hydraulic components has been over looked:- ASSESSMENT OF CORROSION AND WEAR - you need to work out whether it is really worth your while putting in new set of seals and trying to bleed calipers that really could do with machine work...

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!