Carry on and pull them apart - you won't do any damage. Remember you will have brake fluid in the system and it'll destroy and paint it touches.
You can bleed the rear brake with only the one bleed screw. You just need to make sure that this screw is the highest point of the caliper which might mean you have to bleed the thing while it's off the bike. But of course you only need to bleed when you're putting them back on the bike after rebuilding.
You can bleed the rear brake with only the one bleed screw. You just need to make sure that this screw is the highest point of the caliper which might mean you have to bleed the thing while it's off the bike. But of course you only need to bleed when you're putting them back on the bike after rebuilding.