How do I, pop pistons out of M calipers Options

[qa1142]

Ok, so starting work on 5 lug parts

Flair fittings and bleeders are both free (IMG:style_emoticons/default/shades.gif)

pulled hardware, cleaned on wire wheel, pads look new but for price will replace

I tried air gun in flair fitting hole, pistons did not move, what is my next step? Pull the seals and get pliers on the lip?

Do I need to split the halves to rebuild these?

Will

[davep]

Never use pliers!!
I only use air after rebuilding, and even then with a lot of care; pistons come out like cannonballs when you use air. For popping pistons I always use a hydraulic system; a pedal cluster with master cylinder and reservoir. You get much more pressure, and only a tiny fluid leak when the pistons are free. I don't know of any easy way to do a proper job without splitting. I always hone the bores. It is a lot of work to do properly.
Since you are in the USA, I'd suggest having Eric Shea rebuild them for you. It is not worth the time you spend doing it yourself, and his are basically new when delivered.