A trick that I have used a few times to get the pistons out is to use a grease gun. I unscrew the end which pushes on the grease fittings and screw that into the caliper. The use the pump to push grease into the caliper which pushes out the piston nice and slow. The grease is coated in old brake fluid and cleans out nicely. Much safer than using air and having the pistons pop out.
Mike
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87 "Turbo-Look" Cabriolet
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