To replace the rear disc brakes on a Ford Focus you need to purchase special tools from the dealership to retract the piston. Unlike many vehicles, you can't use a C-clamp or needle nose pliers, as it will damage the piston. The tools you need are Rear Caliper Piston Adjuster 206-010 and Adapter 206-026. After you get the tools, read further to learn how to replace your rear disc brakes.
Lift the Focus off the ground with a car jack and secure it on all sides to prevent it from falling over. Loosen the lug nuts with a torque wrench and remove the wheels.
Separate the brake caliper from the parking brake cable. Make the brake hose connection loose and separate the brake caliper from the brake anchor plate. Take off the brake caliper and slip out the brake pads.
Retract the brake piston using the special tools purchased from the Ford dealership. You will need the Rear Caliper Piston Adjuster 206-010 and Adapter 206-026.
Replace the brake pads with the new ones. Lay the caliper over the top of the brake pads and secure the bolts using a torque wrench. Tighten the bolts to 26 ft. lb.
Fasten the brake cable to the brake caliper. Replace the wheels and lower the Focus to the ground. Bleed the brakes if necessary.
Keep children and animals away from the raised vehicle when replacing rear disc brakes.