How do I replace 2000 gmc sierra parking break shoes?

Last I heard, the parking brake just pulls in the rear brake shoes!

^^^^ Today, many vehicles have rear disc brakes with what is called a "drum and hat" rotor. The drum part of the rotor houses a 1-piece shoe that is cable actuated as a parking brake.

To replace, the caliper must be removed along with the caliper bracket. By using a long flat heat screw driver, you can drive the shoe downward and out of the actuator (looks like a hydraulic brake wheel cylinder). The shoe will fall, and though it seems that the axle is in the way, the old shoe will twist off around the hub and out. Re-install the way it came out, making sure to inspect old rotor to make sure it is in good shape to accept a new parking brake shoe.