Ford DG1Z-1125-C Rotor Assembly

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Begin by loosening the wheel lug nuts, raising the vehicle and supporting it securely on jackstands. Remove the brake caliper; it isn't necessary to disconnect the brake hose. After removing the caliper bolts, suspend the caliper out of the way with a piece of wire. Visually inspect the disc surface for score marks and other damage. Light scratches and shallow grooves are normal after use but deep scoring requires disc removal and refinishing by an automotive machine shop. Check both sides of the disc.To check disc runout, place a dial indicator at a point about 1/2-inch from the outer edge of the disc. Set the indicator to zero and turn the disc. The indicator reading should not exceed the specified allowable runout limit. If it does, the disc should be refinished by an automotive machine shop. It's recommended to have the discs resurfaced regardless of the dial indicator reading, to impart a smooth finish and ensure a perfectly flat surface. At the very least, remove the glaze from the surface with emery cloth or sandpaper, using a swirling motion.It's absolutely critical that the disc not be machined to a thickness under the specified minimum thickness. The minimum thickness is cast or stamped into the inside of the disc. The disc thickness can be checked with a micrometer. To remove the disc, discard the caliper mounting bracket bolts and remove the bracket. The caliper mounting bracket bolts are one-time use, so always use new ones when installing the caliper. Remove and discard the disc retaining screw and remove the disc.For installation, while the disc is off, wire-brush the backside of the center portion that contacts the wheel hub and clean off any rust or dirt on the hub face. Apply small dots of high-temperature anti-seize around the circumference of the hub, and around the raised center portion. Place the disc in position over the threaded studs, install a new disc retaining screw and tighten to the correct torque. Install the caliper mounting bracket and caliper; use new bolts and tighten them to the correct torque. Install the wheel, then lower the vehicle to the ground. Tighten the lug nuts to the correct torque. Depress the brake pedal a few times to bring the brake pads into contact with the disc. Bleeding won't be necessary unless the brake hose was disconnected from the caliper. Check the operation of the brakes carefully before driving the vehicle. If new or resurfaced rear discs are being installed, check the operation of the parking brake.