Agree that it's probably OK as long as you didn't do anything to the surface that contacts the dust seal and heat shield. If it was stuck so badly you couldn't get it our with air, though, I would think the caliper and piston would have a fair amount of corrosion.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe