the rear disc piston needs to be rotated while pushing in...get the tool from the parts store, or use a screwdriver carefully... also everyone should have a manual for their vehicle, and the library should have a professional manual available...in the reference section, you'll have to make copies of the important sections...good luck :)
If they are the same as a 97 Maxima then you twist them, don't compress them. To compress the piston you do it with a 'Disk Brake Piston Tool'. You can get this at Pep Boys for $12. To compress the piston on the passenger side you turn the piston clockwise. To compress the piston on the driver side you turn the piston counter-clockwise. Be careful trying to turn the piston using pliers or some other tool as you may tear the rubber seal around the piston.
you can use a C clamp and squeeze the cylinder down and then your brake shoes should be far apart enough to just fit on the rotor.
Turn it to the right
If it is the front brake use a "C" clamp to retract piston If it is the rear and the parking brake is used by this caliper piston is threaded and a special tool (not expensive) available at Sears or auto parts to "screw" piston into caliper body
dont compress, take brake caps off and it's self adjusting so turn it back clockwise,. behind the brake pads. For Rear Brakes: Use either a needle-nose pliers (difficult) or a "brake tool" (available at any autoparts store) to rotate the piston. For Front Brakes: Just use a C-clamp to (gently!!!) push the piston inward. The Piston in the rear brake caliper screws in. There are two holes to insert a tool into to rotate the piston. Get the special tool at any auto parts store, It'll be worth the $4 or $5 dollars.
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Brake piston? Front use a "C" clamp to compress Rear - Piston is threaded turn clockwise to compress (water pump pliers?)
You can use a large C-Clamp to compress the caliper piston.
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they make a tool for it that you should be able to buy at any parts store, i was able to use a pair of needle-nose pliers, open the pliers and put the tips into the notches on the inside of the caliper piston, turning clockwise will compress the piston.
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