I never do brakes for anyone but family, too much liability if they don't work properly.
Caliper replacement isn't much more work than changing pads.
You might want to replace the rubber line at the same time, too -- cheap, and a new one won't go bad as soon as an old one!
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!