Question 1

Front wheel camber is measured with the front wheels turned to the right.

Accepted Answer

Front wheel camber is measured with the wheels in a straight ahead position, not turned to the right or left.

Question 2

Technician A says incorrect wheel alignment angles will reduce tire tread life. Technician B says wheel alignment is necessary after ball joint replacement. Who is correct?

Accepted Answer

Both technicians are correct. Incorrect wheel alignment angles can cause uneven wear on the tires, reducing tread life. Wheel alignment is necessary after ball joint replacement to ensure that the suspension and steering components are properly aligned and that the vehicle handles correctly.

Question 3

Technician A says excessive positive caster may cause front wheel shimmy. Technician B says excessive positive caster increases steering effort and causes harsh riding. Who is correct?

Accepted Answer

Excessive positive caster can cause front wheel shimmy as stated by Technician A. Technician B is also correct that it can increase steering effort and cause a harsher ride. Therefore, both A and B are correct.

Question 4

Positive caster occurs when the caster line through the centers of the lower ball joint and upper strut mount is tilted forward in relation to the true vertical centerline of the tire and wheel viewed from the side.

Accepted Answer

Positive caster occurs when the caster line (through the centers of the lower ball joint and upper strut mount) is tilted backward, not forward, in relation to the true vertical centerline of the tire and wheel when viewed from the side.

Question 5

All of the following are advantages of a four-wheel alignment EXCEPT:

Accepted Answer

A four-wheel alignment can improve fuel mileage, vehicle handling, and tire life, but it does not increase emissions. In fact, properly aligned wheels can help reduce emissions by optimizing engine efficiency.

Question 6

Some computer wheel aligners provide a ride height screen indicating where the ride height should be measured.

Accepted Answer

Some computer wheel aligners do provide a ride height screen indicating where the ride height should be measured.

Question 7

Positive camber is the outward tilt of the camber line in relation to the true vertical centerline of the tire and wheel viewed from the front.

Accepted Answer

Positive camber means the top of the tire is tilted outward from the centerline of the vehicle, so it has an outward tilt in relation to the vertical centerline of the tire and wheel.

Question 8

Improper caster adjustment results in feathered tire wear.

Accepted Answer

Feathered tire wear is typically caused by incorrect toe alignment, not caster adjustment.

Question 9

Technician A says wheel alignment angles are designed to provide improved ride qualities. Technician B says wheel alignment angles are designed to provide minimum tire tread wear and predictable directional control. Who is correct?

Accepted Answer

Both technicians are correct. Wheel alignment angles, such as camber, caster, and toe, can affect ride quality by improving stability, reducing vibration, and providing better steering response. These angles also play a significant role in maximizing tire life and ensuring predictable vehicle control.

Question 10

Proper ride height adjustment is very important to maintain vehicle directional control and  safety.

Accepted Answer

The answer of Proper ride height adjustment is very important...

Question 11

Excessive positive caster results in harsh ride quality.

Accepted Answer

Excessive positive caster results in a harsh ride quality due to increased road shock transmission, which can be uncomfortable for passengers.

Question 12

Technician A says a tire pressure check is not required before a wheel alignment. Technician B says a front wheel bearing play should be checked before a wheel alignment. Who is correct?

Accepted Answer

Technician B is correct. It is important to check for any worn front wheel bearings before performing a wheel alignment as they can cause improper alignment readings. However, Technician A's statement is incorrect as checking tire pressure is an important step in the pre-alignment process.

Question 13

Ride height can be adjusted by repositioning the upper strut mounts on a MacPherson strut front suspension.

Accepted Answer

Repositioning the upper strut mounts is not a method used to adjust ride height in a MacPherson strut suspension. Ride height is typically adjusted by changing the springs or using adjustable coilovers.

Question 14

The thrust line is an imaginary line positioned at a 90 degree angle to the rear wheel centerline and projected forward.

Accepted Answer

The statement is correct. The thrust line helps to determine the direction of forces acting on the vehicle and can affect its stability and handling.

Question 15

Technician A says excessive toe-out (negative) on a front wheel causes rapid wear on the inside edge of the tire tread. Technician B says excessive positive camber on a front wheel causes premature wear on the outside edge of the tire tread. Who is correct?

Accepted Answer

Both technicians are correct. Excessive toe-out (negative) on a front wheel causes rapid wear on the inside edge of the tire tread, while excessive positive camber on a front wheel causes premature wear on the outside edge of the tire tread.

Question 16

All of these statements about improper caster are true EXCEPT:

Accepted Answer

Improper caster can cause pull while braking, front wheel shimmy, and excessive steering effort. However, it is not typically associated with feathered tire tread wear.

Question 17

Caster adjustments may be provided by all of these methods EXCEPT:

Accepted Answer

Adjusting tie-rod length affects toe settings, not caster adjustments. Caster adjustments are typically made through methods such as adjusting strut rod length, adding or removing shims to the upper control arm, or using upper control arm eccentrics.

Question 18

Excessive toe-in on the front wheels causes wear on the inside edge of the tire treads.

Accepted Answer

Excessive toe-in typically causes wear on the outer edges of the tire treads, not the inside.

Question 19

What effect will an incorrect rear wheel thrust angle have on the front suspension?

Accepted Answer

An incorrect rear wheel thrust angle can cause the steering wheel to be off-center as the vehicle's front wheels adjust to compensate for the misalignment at the rear, affecting the steering wheel position to maintain straight driving.

Question 20

Diagonal wear lines on the rear tires could be caused by what?

Accepted Answer

Diagonal wear lines on the rear tires are typically caused by a toe angle error. This means that the rear wheels are not pointing in the same direction as the front wheels, creating a "scrubbing" effect as the tires move diagonally. Camber angle error, wheel offset, and ride height error would not typically cause diagonal wear lines on the rear tires.

Quiz 9: Four Wheel Alignment Part 1 Primary Angles