Question 1

Toe-out on turns is:

Accepted Answer

Toe-out on turns refers to both the turning radius (which affects the angle of the steering axle) and the measurement of the angle of one wheel while the other is turned a specified amount. Therefore, both options B and C are correct.

Question 2

Technician A says improper toe will feather wear the tread and may cause steering problems. Technician B says if the centerlines of the tires are equal, the wheels are toed out. Who is correct?

Accepted Answer

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Question 3

What determines the tread contact patch's friction ability?

Accepted Answer

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Question 4

When the plies are parallel to the tire's radius, then the tire is of what type construction?

Accepted Answer

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Question 5

To inspect loaded ball joints that do not have wear indicators, the technician must:

Accepted Answer

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Question 6

Technician A says the thrust angle is the angle between the geometric centerline and the thrust line. Technician B says the thrust line is the direction in which the rear wheels are pointing. Who is correct?

Accepted Answer

Both Technician A and Technician B are correct. The thrust angle is indeed the angle between the geometric centerline (an imaginary line that splits the vehicle into equal halves) and the thrust line (which is the average direction in which the rear wheels are pointing). This concept is crucial in wheel alignment to ensure the vehicle drives straight and does not pull to one side.

Question 7

Why is the caster on the rear wheels usually zero? What situation may require some rear wheel caster?

Accepted Answer

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Question 8

Define scrub radius.

Accepted Answer

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Question 9

Define carcass.

Accepted Answer

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Question 10

Technician A says when the pivot point is inside the tire contact point, the scrub radius is positive. Technician B says when the pivot point is outside the tire contact point, the scrub radius is negative. Who is correct?

Accepted Answer

Technician A is correct in stating that a pivot point inside the tire contact point results in a positive scrub radius. Technician B is correct in stating that a pivot point outside the tire contact point results in a negative scrub radius. Therefore, both technicians are correct.

Question 11

A vehicle pulls towards the left while driving. Which of the following would be the most likely cause?

Accepted Answer

B) Left camber 2 degrees, right camber .25 degree is the most likely cause because a significant difference in camber angles between the left and right wheels can cause the vehicle to pull towards the side with the more positive camber. In this case, the left camber being much higher than the right would likely cause the vehicle to pull to the left.

Question 12

Lower-profile tires have an aspect ratio that is lower than:

Accepted Answer

Lower-profile tires typically have an aspect ratio lower than 50, meaning the sidewall height is less than 50% of the tire's width.

Question 13

Define geometric centerline.

Accepted Answer

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Question 14

Define casing.

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Question 15

Define thrust line and its relationship to steering and braking.

Accepted Answer

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Question 16

Technician A says improper toe on one rear wheel will create a thrust angle change in the rear axle. Technician B says setback can be the result of a collision. Who is correct?

Accepted Answer

Technician A is correct because an improper toe on one rear wheel will create a thrust angle change in the rear axle, leading to handling problems and tire wear. 
Technician B is also correct because setback (the difference in distance between the front wheels and the rear wheels on one side of the vehicle compared to the other side) can be the result of a collision, which can also cause handling problems and tire wear.

Question 17

Technician A says the first check of the suspension should be with the vehicle supported on a lift. Technician B says the first check of the suspension should be the springs through ride height. Who is correct?

Accepted Answer

Technician B is correct. The first check of the suspension should be the springs through ride height to determine if they are broken or sagging. This can be done with the vehicle on level ground or a lift, but it is not necessary for the vehicle to be supported on a lift for this initial check.

Question 18

Explain why a worn ball joint may cause steering and braking problems.

Accepted Answer

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Question 19

Technician A says that too much torque on the lug nuts can warp a brake rotor. Technician B says that it is better to add additional torque to the lug nuts to prevent the wheel from falling off. Who is correct?

Accepted Answer

Technician A is correct. Too much torque on the lug nuts can cause the brake rotor to warp, which can lead to brake pulsation and steering wheel vibration. It is important to follow the manufacturer's recommended torque specifications. Over-torquing the lug nuts is not recommended.

Question 20

Define wheel alignment.

Accepted Answer

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Quiz 3: Related Systems: Tire, Wheels, Bearings, and Suspensions