You can use compressed air to pop them out. You have the caliper off anyway so just replace it. Thats what I did last time that happened to me. After you pay for a rebuild kit and fiddle with it it's just easier to pop a new caliper on.
'73 SeriesIII coiler,"The Goat", Daihatsu 2.8TD,Santana,Ashcroft,ARB's,etc., now SOLD