Disc Brake System: Testing and Inspection

NOTES:
^ This procedure applies to components of front or rear disc brakes(if equipped).
^ Brake pulsation brake roughness that is present during brake application is caused by either foreign material build-up or contamination on the rotor brake surface or uneven brake rotor thickness caused by runout.

1. Raise and support vehicle.
2. Remove wheel and tire assemblies from vehicle.





3. Inspect brake pads and linings for wear. If the lining is worn replace all four brake pad and lining assemblies (complete axle set) on front or rear wheels as required.
- Front Minimum - 3mm (0.125 inch)
- Rear Minimum - 3.12mm (0.123 inch)
4. Visually check disc brake caliper. If disc brake caliper housing is leaking, it should be replaced. If a seal is leaking, disc brake caliper must be disassembled and new seals installed. If a caliper piston is seized in bore, a new disc brake caliper is required. Care should be taken not to scratch the caliper piston.
5. Inspect disc brake caliper locating pin to make sure an adequate amount of Disc Brake Caliper Slide Grease D7AZ-19590-A or equivalent meeting Ford specifications exists.
6. Each time the brakes are serviced the front and rear disc brake rotors should be checked for scoring, runout, parallelism and thickness. Front and rear disc brake rotor scoring and runout may be checked with the front and rear disc brake rotors either on or off the vehicle. To check parallelism and thickness, the front or rear disc brake caliper must be removed. Refer To Brake Rotor/Disc. .

CAUTION: Failure to tighten lug nuts in a star pattern may result in high rotor runout, which will speed up development of brake roughness, shudder and vibration.

6. Install wheel and tire assembly on vehicle. Tighten lug nuts to 115-142 Nm (85-104 ft. lbs.) using Accutorq Lug Nut Socket or equivalent, on a 1/2 inch air impact wrench or use a torque wrench.
7. Lower vehicle.