Low pressure (15 psi) air will push the pistons out -- you can use a C-clamp to hold one side in while pushing the other out. The only parts I ever replace are the dust boot, heat shield, and piston seal, which is what comes in the kit.

I've always felt that since I could easily do the work without taking the halves apart, there is not need to do so, so I don't.

If a piston is so stuck you have to take huge visegrips to get it out, both piston and caliper are shot, don't bother, get another one.

Scratches, gouges, dents, and rough spots will cause the piston to either stick or refuse to seal, so if not perfect below the seal, ditch it. Not worth the cost of loosing brakes at a deeply incovienent moment.....

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!