You will need some antiseize to put on the pads to keep them from squealing -- some on the back where the piston touches the pad and some on the EDGES of the backing plate, never ever on the friction material!

Check the condition of the rubber boot around the pistons in the caliper. If there is any damage, replace the rubber parts in the caliper (called rebuilding) -- otherwise, if the dust boot fails, the caliper will stick, causing more problems.

While you are in there, this is a good time to change the brake fluid if you have not done so in the last couple years. Check the condition of the hoses, replace any with cracks or bulges. Clean the slots in the caliper where the pads fit, or they can stick instead of sliding freely, also crud in there can make them squeal.

Push the calipers back with something like a large screwdriver or heavy putty knife. One of those small prybars with a screwdriver handle is the ticket here, you want to push back in the center of the pad.

If it is very difficult to push the pad back, just get it loose enough to pull out and use a deep C-clamp to push the piston back.

Check the rotor thickness before replacing pads, though -- if there is a distinct lip around the outer edge, the rotor is worn out and must be replaced -- new pads on a too-thin rotor will result in the backing plate contacting the anti-rattle spring. This causes the pistons to be forced crooked in the caliper bore, and they stick, overheating the caiper and cooking the rubber parts. If the backing plate is already very close to or touching the antirattle spring on your current pads, get rotors too.

Check the tire rod ends and suspension parts for cracked or torn boots and any loose parts. Check tires for even wear and damage, since you have them off.

Check ball joints for play and stiffness, check play in steering parts.

Clean the wheels.

Check wheel bearing play, correct if excessive.

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!