Table of signs of tire failure (Focus 1)

State	Possible Causes	Action
•Excessive wear of tires on the tread edge	•Tires are underinflated.	• ADJUST tire pressure.
	•Vehicle overload by weight.	•ADJUST as necessary.
	•High speed on turns.	•ADJUST as necessary.
	•Wheel alignment is incorrectly adjusted. •Wheel alignment is incorrectly adjusted.	•ADJUST wheel alignment to specification. Refer to Section 204-00 for additional information.
•Excessive tire wear in the center of the tread	•Tires are overinflated.	• ADJUST tire pressure.
	•Excessive acceleration or braking.	•ADJUST as necessary.
•Other types of increased tire wear	•Incorrect tire pressure.	• ADJUST tire pressure.
	•Wheel rotation required.	•REROTATE the wheels.
	•Incorrect front wheel alignment angles.	•ADJUST the front wheel alignment. Refer to Section 204-00 for additional information.
	•Vehicle overload by weight.	•MATCH the load specification with the required payload size.
	•Loose fastening or leakage in the struts and spring assembly.	•TIGHTEN or INSTALL new components as required. Refer to Section 204-01 / 204-02 for additional information.
	•Worn wheel bearings.	•INSTALL new wheel bearings. Refer to Section 204-01 / 204-02 for additional information.
	•Suspension components, bushings and ball joints.	•INSPECT, REPAIR or INSTALL new items as needed.
	•Excessive axial or radial runout of the wheel or tire.	•CHECK, REPAIR or INSTALL new components as necessary. Use a dial indicator to accurately measure runout.
•Difficulty installing the wheel	•Incorrect application or combination of components, including wheel studs and nuts.	•FOLLOW manufacturer's specifications.
•Rust or corrosion of the wheel disc	•Poor care.	•CLEAN and APPLY paint.
•Wheel angular oscillations ("shimmy") affecting runout	•Wheel damage.	•INSPECT wheel rims for dents. INSTALL new parts as needed.
	•Front wheel bearing.	•INSTALL new wheel bearings as required. Refer to Section 204-01 for additional information.
•Increased vibration of the car, lack of smoothness when using the steering wheel	•Suspension elements.	•TIGHTEN or INSTALL new components. Refer to Section 204-01 (Front Suspension) for additional information. Refer to Section 204-02 (Rear Suspension) for additional information.
•Vehicle vibration caused by tires and wheels	•Tire pressure.	• ADJUST tire pressure.
	•Wheel or tire imbalance.	•PERFORM BALANCING of the wheel assembly.
	•Uneven wear of the tire tread.	•INSTALL new tire(s) if necessary to eliminate vibration.
	•Unbalance of brake discs.	•CHECK the brake rotor vent holes for dirt and foreign matter. If no damage or foreign matter is found, the brake rotor may have a hardened area. Refer to Section 206-00 for additional information.
	•Water penetration into tires.	•REMOVE water.
	•Wheel disc deformation.	•INSTALL a new wheel rim. Trying to straighten the wheel rim may cause cracks and weaken the rim.
	•Incorrect fit of the tire bead.	• ROTATE the wheel with it on the vehicle. INSPECTE the area where the wheel rim and tire meet. If the tire appears wavy in this area while rotating, the tire bead may not be seated on the wheel rim. REMOVE the tire and CLEAN the bead seating areas on the wheel rim and on the tire. REFER to the Cleaning and Inspection section of the repair procedures.
	•Radial runout of a wheel or tire.	•Using a dial indicator, check the wheel and tire for radial runout. If the tire or wheel is out of specification, CHECK the wheel stud circle runout. If the parts are out of specification, INSTALL new parts.
	•Wheel stud, wheel nut or enlarged stud holes.	•TIGHTEN or INSTALL new components as necessary.
	• Penetration of foreign material between the contact surfaces of the wheel and hub.	•CLEAN contact surfaces.
	•Wheel or tire end runout	•Using a dial indicator, check the rim and tire for axial runout. If the tire or wheel is out of specification, CHECK the wheel hub for axial runout. If the items are out of specification, INSTALL new items.
	•Front wheel bearing.	•INSTALL a new element as required. Refer to Section 204-01 for additional information.
•The appearance of cracks on the back side of the rim base (rim bead seating) or in the drainage area (in the drain recess)	•Excessive load or careless operation.	•INSTALL the new tire. CHECK loading and operating conditions. Avoid over-inflation of tires. CHECK specifications for rim load capacity, payload, tire size, ply rating, and tire geometry.
	•Incorrect use of tools.	•CHECK installation, removal and maintenance procedures.
• Damage to wheel stud threads	• Lateral displacement of the wheel relative to the wheel studs during assembly.	•INSTALL new wheel studs. INSTALL the wheel according to instructions.
•Broken wheel studs	•Loose wheel nuts.	•INSTALL new wheel stud. TIGHTEN to specification.
	•Overload.	•INSTALL new wheel studs. TIGHTEN to specification. Compare actual load to vehicle load specifications.
•Stripped threads	•Excessive tightening torque.	•INSTALL new studs and wheel nuts. TIGHTEN to specification.
•Traces of rust in the holes for the wheel studs	•Wheel nuts.	•CHECK the entire assembly. If there are damaged components, INSTALL new components. TIGHTEN to specification.
•Damaged wheel nuts	•Wheel assembly.	•INSTALL new wheel nuts. TIGHTEN to specification.
	•Wheel nuts are too tight.	•FOLLOW the prescribed tightening procedure.
•Wheel nuts jamming	•Corrosion.	•WARNING: Do not allow grease to come into contact with the tapered areas of the wheel stud and nut bores. If corrosion is light, remove any traces of corrosion with a wire brush. If corrosion is severe, INSTALL new wheel studs and nuts. If corrosion persists, LUBRICATE the first three threads of each wheel stud with graphite-based lubricant
	•Excessive tightening of wheel nuts.	•FOLLOW the prescribed tightening procedure.