Just keep stroking the parking brake lever on the caliper or the pedal in the car. You can't over-adjust it. If you can find a helper to press the pedal for you, you will see the pads contact the rotor and you won't be able to turn the rotor by hand when it's adjusted.
Every time you stroke the parking brake, the piston will come out a little. It will stay there when you release the parking brake. When you press the service brake pedal, the piston will also come out a little, but it will retract again when you release the pedal. On a front caliper, the square-cut seal can't bend very much, so the piston slides through it to self adjust. On the rear, the seal bends so much, the piston doesn't slide through it. When the brake is released, the seal straightens out and pulls the piston back with it. It takes the parking brake to get enough movement for the piston to slide through the seal. There's a ramp and ball setup or a screw thread that turn with the parking brake lever. After it turns a specific amount, it latches there preventing the pston from coming back. Thats why you have to remove the lever and turn the hex nut underneath to retract the piston.
By the way, did you fill the calipers with fluid before you installed them? You have to do that to fill the pistons with fluid. The air won't bleed out of the piston once it's installed. If there's air in the pistons, you'll never get a solid pedal. It's possible the rebuilder put fluid in the calipers already, but my guess is they didn't because unless it's perfectly sealed, the fluid will absorb moisture out of the air.
Sunday, February 28th, 2010 AT 12:42 PM