Training Wheel Hero
Join Date: Sep 2012
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If you don't have access to compressed air, hook them up to a brake line and use the brake fluid to pump them pistons out. The tricky part is going to be getting them all out far enough where you can move them with your fingers. Maybe take out one piston at a time, clean, replace, then take out another piston?
Easiest way by far is to make friends with someone with the right tools. Professional mechanic, guy in a garage down the street, whatever.