you use a c clamp that's how i do it on all the the vehicle's that i work on if this help's you
How do you compress the rear break caliper, pistons on a 2002 Sierra ?
Yes.
you have to turn the piston like a bolt
I have used a large "C" clamp, to compress the caliper flush to the face.
Replace the caliper and bleed the brake system.
You will need a caliper rewinding tool
Do not try to compress you will damage the caliper! You need to get a caliper tool and twist them in. look for caliper tool at Harbor Freight http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=40732 Caution both sides turn in opposite directions. Passenger side turns clockwise. Driver side turns counter clockwise.
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It requires a special tool to turn and compress the piston in at the same time.
with a c clamp. put a block of wood or your old pad over the piston and tighten with clamp.
You need a caliper tool and a ratchet. Caliper tool is a cube with prongs on it, a couple dollars at a parts store or online. Just turn the caliper tool and on the caliper and it will compress.
The 2005 Mazda MAZDA6 has 37.1 in. of rear head room.