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If the pistons don't move back smoothly with minimal pressure, rebuild the calipers. Pretty cheap, doesn't take long, and you need to change the brake fluid anyway.
I've "unstuck" pistons so that they appeared to work properly, but when taken out the piston seal wasn't square anymore....
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!
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