In order to replace the rear disc brakes on a Toyota Corolla you need to purchase a special tool from the dealership. The tool's item number is SST 09719-14020 and rotates the piston clockwise into the bore. With this tool and these instructions, you can replace your rear disc brakes and still have plenty of time left in your day.
Raise the Corolla from the ground using a car jack to remove the wheels and access the rear disc brakes. Support the vehicle on all sides to prevent falling. Watch for children and animals that may crawl under the car.
Remove the caliper mounting bolts by loosening them with a torque wrench. Remove the bolts followed by the caliper assembly. Move the brake line aside without disconnecting it.
Slip out the brake pads. Take out the shims, springs, pad wear indicators and pad support plates at the same time.
Replace the pad support plates on the torque plate. Attach the pad wear indicators to the brake pads, making certain the arrow on the indicator points in the direction the wheel rotates.
Attach the shims to the brake pads. Fasten each completed assembly to the torque plate.
Push the caliper piston into the bore. Use tool SST 09719-14020 to turn the piston clockwise while pushing it into the bore until you hear a clicking noise. Lay the caliper across the pads and tighten the mounting bolts.
Reassemble the wheels. Lower the Toyota Corolla to the ground and then verify the brake fluid level.