Also be VERY careful when using the compressed air. The pistons will come out with a lot of force even when you are using a fairly low pressure, I mean cannon force! A C-clamp can be used to keep the pistons from coming all the way out... this might make it easier to get them both out, did for me anyway.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k