Debi:

What's wrong with the caliper you want to replace? The pads are throw-away, but to replace them all you need to do is remove the cap on the master cylinder and push the piston back into the caliper.

If it won't move, it's stuck and the brakes were dragging. To use brake fluid to remove the stuck piston, you remove the caliper but leave the brake hose attached. Hold the other piston in place with a C-clamp and pump the brake pedal until the brake fluid forces the piston out. Messy but effective -- when the piston comes out, all the brake fluid will spill on the floor.

I can be of more assistance if you tell me why you think you need a new caliper.

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!