It doesn't take much dirt in the caliper to cause it to seize. Do the other side while you are at it, it's in the same shape, just not stuck yet, I'd bet!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!