Well I would soak them in WD40 and may be a little push on the pedal a little to see if the piston moves but make sure you have something in them so the dont push out fully and you can still get the tool in to wind them back.
I will have a hunt around and see if I can find some more info.
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OEM RS4 Body| RS4 front Brakes| RS4 shocks & H&R Race springs| RS4 Xenons| 18" BBS RC wheels| Scroll K04 Outlaw|RaceTec FMIC| Southbend StageIII clutch| Autobahn88 Silicon hoses| Baileys DV| Waiting to be fitted: TT MAF| 380 injectors| RS4 Rear brakes & a Remap
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