CDX - Brakes Chapter 48

If a vehicle uses serviceable bearings, the maximum allowable play is approximately _____.

0.010"

Faulty bearings create an unusual noise which usually can be heard once the vehicle gets up to _____ mph.

15-20

When adjusting serviceable wheel bearings, the final adjustment (2nd adjustment) should be approximately:

15-25 in-lb (1.69-2.82 N.m)

Maintenance is commonly performed during brake show/pad replacement or at intervals specified by the vehicle manufacturer, usually around _____.

24,000 to 30,000 miles

At what positions is it best to grab the tire and lift the wheels off the ground to check the wheel bearings for looseness?

6 o'clock and 12 o'clock

Which component of wheel bearings holds the rollers or balls in place?

A bearing cage

Choose the correct statement:

A garter spring helps maintain an adequate seal if the parts are slightly out of alignment.

On adjustable wheel bearings, the proper clearance must be set using the _____.

Adjusting nut

Which of the following can be a design of a sealed bearing assembly?

All of these can be designed as a sealed bearing assembly

Which of the following organizations classifies the service grade of a gear lube?

American Petroleum Institute (API)

The component in a wheel bearing that maintains the proper spacing between the roller bearings or ball bearings is called a(n) _____.

Bearing cage

A ______ is a tool that forces grease into the spaces between the bearing rollers.

Bearing packer

Which of the following is NOT a common tool used to maintain and repair wheel bearings?

Bore gauge

It can be a challenge to distinguish between a wheel bearing noise and a tire noise. The best approach to this problem is to drive over different road surfaces. Tech A states that if the noise changes, it is likely a tire problem. Tech B states that if the noise does not change, it is likely to be a faulty wheel bearing. Who is correct?

Both A and B

Tech A says that cylindrical roller bearings can carry more weigh than similarly sized ball bearings. Tech B says that tapered roller bearings used in opposing pairs control side thrust in both directions. Who is correct?

Both A and B

Tech A says that over time a grease seal can wear a groove in the sealing surface of the axle or shaft. Tech B says that grease seals need to be replaced every time the bearing is removed. Who is correct?

Both A and B

Tech A says that unitized hubs have a wheel nut with a higher installation torque than serviceable wheel bearings. Tech B says that unitized hubs have the proper bearing end play designed into the assembly once they are torqued properly. Who is correct?

Both A and B

Technician A says that wheel bearings can be damaged from hitting a large pothole. Technician B says that wheel bearings can be damaged from improper adjustment. Who is correct?

Both A and B

Tech A says that wheel bearing assemblies include roller bearings. Tech B says that wheel bearing assemblies include ball bearings. Who is correct?

Both Tech A nor B

Technician A says that sealed bearing assemblies are prefilled with lubricant and have integrated grease seals built into them. Technician B says that sealed bearing assemblies makes for more reliable and consistent installation process since every unit comes preset at the proper clearance. Who is correct?

Both Technician A and Technician B

Technician A says that the wheel bearing can damage the wheel hub or spindle/axle in a vehicle. Technician B says that one way that bearing failure is indicated is when the race spins in either the machined bore of the wheel hub or the surface of the spindle/axle. Who is correct?

Both Technician A and Technician B

Tech A says that packing a wheel bearing assembly can be done by hand with proper results. Tech B says that packing a wheel bearing assembly with a bearing packet will get the proper results. Who is correct?

Both Techs A and B

A normal part of servicing wheel bearings includes the replacement of the old grease seals with new ones along with the _____ (if used), which retains the wheel bearing adjusting nut.

Cotter pin

In a 3/4 floating axle design, there is a single bearing assembly (usually a ball or _____ style) between the outside of the axle tube and the hub.

Cylindrical roller bearing

Nearly all wheel bearings using a ball bearing assembly are of the _____ variety, and they are commonly used in automotive light vehicle applications.

Double-row ball bearing

Gear lube is somewhat thinner than engine oil.

False

Serviceable wheel bearings should be serviced periodically only if a faulty wheel bearing is suspected.

False

When servicing wheel bearings, it is ok to mix different types of grease.

False

In which of the following rear drive axle designations is a pair of tapered roller bearing assemblies used on each side?

Full floating axle

There are two common types of lubricants used for wheel bearings: _____ and bearing grease.

Gear lube

Which of the following is a component of a typical wheel bearing?

Inner race; outer race

Which of the following organizations grades the thickness of a grease?

National Lubricating Grease Institute (NLGI)

Tech A says that a tapered roller bearing assembly has less rolling resistance than a similarly sized ball bearing assembly. Tech B says that the bearing assembly in a unitized wheel bearing assembly can normally be disassembled, cleaned, and repacked. Who is correct?

Neither A nor B

Tech A says that the best approach to determining if a noise is a wheel bearing or tire is to drive over different road surfaces such as asphalt and concrete. If the noise changes, it is likely a wheel bearing problem. Tech B says that the best approach to determining if a noise is a wheel bearing or tire is to drive over different road surfaces such as asphalt and concrete. If the noise does not change, it is likely a tire problem. Who is correct?

Neither Tech A nor B

Technician A says that if a tapered roller bearing is adjusted too loose, the bearing will bind and overheat. Technician B says that if a taper roller bearing is adjusted too tight, it will have too much side-to-side and up-and-down movement. Who is correct?

Neither Technician A nor Technician B

Tapered roller bearings are used typically in what configuration?

Opposing pairs (both facing different directions)

Failure analysis starts with removing the faulty wheel bearing and cleaning it and the _____ thoroughly.

Races

_____ support the load over a larger surface area so they can carry heavier loads than ball bearings.

Roller bearing

Because tapered roller bearing assemblies use tapered components, the wheel bearing assembly must be adjusted to have the proper _____ between the tapered rollers and races when the bearing assemblies are installed.

Running clearance

All of the following statements regarding sealed and serviceable bearings are true EXCEPT:

Sealed bearing assemblies are prefilled with lubricant and have integrated grease seals, unlike serviceable bearings.

Which of the following axle designations is considered the lightest duty?

Semi-floating axle

Which of the following is a typical category of wheel bearing used in vehicles?

Serviceable; sealed

Most automotive axle seals typically consist of which of the following?

Stamped sheet metal case; flexible seal lip; garter spring

In a full-floating axle, the weight of the vehicle is fully carried by a pair of _____ bearing assemblies, which ride between the hub and axle tube.

Tapered roller

Which type of bearing has an inner race called cone and an outer race called up?

Tapered roller bearing

Sealed wheel bearings are manufactured with the proper running clearance, so they do not need to be adjusted.

True

Tech A says that in a full floating axle, the axle does not support the weigh of the vehicle. Tech B says that when adjusting tapered wheel bearings, the final torque should be about 20 ft-lbs. Who is correct?

Tech A

Tech A says that two different types of lubricants used to lubricate bearings cannot be substituted due to the different housing and seal designs each lubricant demands in a vehicle. Tech B says that the two different types of lubricants used to lubricate bearings can be substituted due to the different housing and seal designs each lubricant demands in a vehicle. Who is correct?

Tech A

Tech A says that wheel bearings need to be replaced as a set, bearing and race. Tech B says that the wheel bearings and races on both sides of the vehicle must be replaced if one side fails. Who is correct?

Tech A

Tech A says that when a race is fully seated, a sharp metallic sound is produced when installation is complete. Tech B says that to be sure a race is fully seated, the wheel bearing adjustment nut should be tightened to at least 100 ft-lbs of torque, which will finish seating it. Who is correct?

Tech A

Tech sys that wheel bearings must be replaced as a set, bearing, and race. Tech B says that the wheel bearings and races on both sides of the vehicle must be replaced if one side fails. Who is correct?

Tech A

Tech A says that if you add pre-lube to a sealing lip of an axle seal, it will cause overheating during the initial use resulting in a premature failure of the seal. Tech B says that when you install a seal, always remember to pre-lube the sealing lip with a small amount of oil or grease. Who is correct?

Tech B

Tech A says that serviceable wheel bearings can be repacked by removing the dust cap, filling it with grease, and reinstalling it. Tech B says that the cotter pin must be replaced with a new one every time it is removed. Who is correct?

Tech B

Tech A says that the gear lube level in the final drive is okay as long as you can touch the level with your finger. Tech B says that the gear lube level should normally be no more than 1/4" below the bottom threads on the fill plug hole. Who is correct?

Tech B

Tech A says that the grease level in the final drive is okay as long as you can touch the level with your finger. Tech B says that the grease level should normally be no more than 1/4" below the threads on the fill plug hole. Who is correct?

Tech B

Tech A says that when installing a bearing race, it should only take finger pressure to install it. Tech B says that on a tapered roller bearing, the race is also called the cup. Who is correct?

Tech B

Technician A says that gear lube and bearing grease cannot be substituted due to the different housing and seal designs each lubricant demands in a vehicle. Technician B says that gear lube is thicker than bearing grease. Who is correct?

Technician A

Technician A says that you should suspect a faulty bearing whenever an unusual howling or rough sound comes from the wheel areas when the vehicle is being driven. Technician B says that you should suspect a faulty wheel bearing whenever an unusual screeching sound comes from the wheel areas when the vehicle is being braked. Who is correct?

Technician A

Technician A states that "serviceable" and "sealed bearings" are typical categories of wheel bearings used in vehicles. Technician B states that sealed bearings require periodical maintenance. Who is correct?

Technician A

All wheel bearings used to be the serviceable type, requiring periodic maintenance every 24,000-30,000 miles (38,624-48280 km), consisting of disassembly, cleaning, inspecting, reassembly, and adjusting.

True

Cylindrical roller bearing assemblies require lubrication to cushion the rollers and races while operating.

True

In most cases, the unitized wheel bearing hub, including a sealed wheel bearing, can be unbolted from the suspension system and a new one bolted in its place, and it is ready to go.

True

Lithium soap is a common thickening agent in automotive grease.

True

Manufacturers determine the type of wheel bearing they will use based on the particular application and its requirements.

True

On most front wheels, the replaceable sealed bearing is pressed between the hub and the wheel flange.

True

Only serviceable wheel bearings need periodic maintenance.

True

Some wheel bearing failures involve the races spinning in either the machined bore of the wheel hub or on the surface of the spindle/axle.

True

The outer race on a double row ball bearing assembly is usually a one-piece unit, while the inner race is usually two separate pieces.

True

The term inner race describes the inside component of a wheel bearing that has a smooth, hardened surface for roller or balls to ride on.

True

True or False. In a full floating axle, the weight of the vehicle is fully carried by a pair of tapered roller bearing assemblies, which ride between the hub and axle tube.

True

True or False. In some applications, the grease seal is press-fi into the axle housing, which is stationary, and seals against the axle shaft, which is rotating.

True

Wheel bearings and races need to be replaced only when they are damaged.

True

_____ can be damaged from excessive loads such as overloading the vehicle, shock loads such as hitting a large pot hole, improper adjustment, or just plain wear over time.

Wheel bearings

_____ play a critical role in the vehicle by allowing the wheels to roll with a minimum of friction while still maintaining accurate wheel positioning under all driving conditions.

Wheel bearings

Which of the following is a method of diagnosing wheel bearing assemblies?

Wiggling the tire; test-driving; rotating the wheel

When installing a cotter pin in a wheel bearing locknut:

adjust the wheel bearing and then install the cotter pin.

In most situations, serviceable wheel bearings are held in place by:

an interference fit

All of the following are components of a typical wheel bearing, EXCEPT:

bearing seat

All of the following are methods of diagnosing wheel bearing assemblies, EXCEPT:

diagnostic scan tool

When packing a serviceable wheel bearing:

make sure to fill the spaces between the rollers with grease.

All of the following statements with respect to lubricants and their application are true EXCEPT:

the higher the viscosity number, the thinner the gear lube.

All of the following can be caused by a loose or worn wheel bearing, EXCEPT:

vehicle engine oil leak