Tire, Wheel, and Wheel Bearing Diagnosis and Repair

All of the following issues may be caused by tire problems except _____.

• abnormal tire tread wear patterns

• steering wheel vibrations or noises

• engine hesitation during acceleration

• steering wheel pull

Automotive tire tread depth that measures less than about _____ is considered worn and requires tire replacement based on safety guidelines.

• 1″ (25.4 mm)

• 1/8″ (3.175 mm)

• 1/2″ (12.7 mm)

• 5/8″ (15.875 mm)

True or False? Underinflation causes the center area of the tire’s tread to expand outward and wear before the outer corners.

• True

• False

Tire sidewalls can bulge outward and form an air bubble in the sidewall due to _____.

• valve stem and valve core separation

• inner tube collapse

• TPMS pressure sensor malfunction

• ply separation

A vehicle’s weight pressing down on _____ produces noticeable humming or growling sounds.

• a new set of tires

• worn suspension shocks or struts

• the vehicle’s frame

• unlubricated, worn, or damaged wheel bearings

True or False? The purpose of performing a tire rotation on a vehicle is to help even out tire tread wear and extend tire service life.

• True

• False

The phrase pack the bearings means to _____ the wheel bearings.

• clean and blow dry

• restrict the movement of

• organize and store

• lubricate

Overtorquing lug nuts can cause wheel or hub distortion, vibration, and excessive _____.

• suspension jounce and rebound

• tire speed

• runout

• steering wheel pull

Technician A says tire impact damage cannot occur when the vehicle is traveling at highway speeds. Technician B says often even minor tire damage, cuts, air bubbles, and tread wear patterns require tire replacement to ensure safe driving characteristics. Who is right?

• A only

• B only

• Both A and B

• Neither A nor B

Technician A says torquing lug nuts correctly means tightening them in a crisscross pattern. Technician B says overtorquing lug nuts is beneficial and recommended on vehicles equipped with aluminum wheels and lightweight hubs. Who is right?

• A only

• B only

• Both A and B

• Neither A nor B