Question 1

Rear axle tramp occurs during:

Accepted Answer

Rear axle tramp occurs when the torque from the engine causes the rear suspension to oscillate up and down, which is most commonly experienced during hard acceleration.

Question 2

Some independent rear suspension systems have a ball joint that attaches the lower control arm to the bottom of the knuckle.

Accepted Answer

Some independent rear suspension systems do indeed have a ball joint that attaches the lower control arm to the bottom of the knuckle.

Question 3

In a multilink rear suspension system, dual upper links connect the top of the strut to the chassis.

Accepted Answer

In a multilink rear suspension system, the dual upper links are part of the system that connects the wheel hub to the chassis, but they do not connect the top of the strut to the chassis. The strut typically connects directly to the chassis at its top end and to the wheel hub or lower suspension components at its bottom end.

Question 4

Rear axle tramp occurs during hard braking.

Accepted Answer

Rear axle tramp typically occurs during hard acceleration or when driving over bumps, not during hard braking.

Question 5

Technician A says when measuring rear suspension curb riding height, the vehicle should be parked on a level floor. Technician B says excessive rear curb riding height causes reduced directional stability. Who is correct?

Accepted Answer

Technician A is correct because measuring rear suspension curb riding height requires a level floor to ensure accurate measurements. Technician B is also correct because excessive rear curb riding height can cause the vehicle to become less stable and have reduced directional stability. Therefore, both technicians are correct.

Question 6

Technician A says in a semi-independent rear suspension system, improper rear wheel toe and tracking may be caused by a bent trailing arm. Technician B says on a semi-independent rear suspension system, improper rear wheel toe and tracking may be caused by a bent inverted U-channel. Who is correct?

Accepted Answer

Both technicians are correct. In a semi-independent rear suspension system, a bent trailing arm or a bent inverted U-channel can cause improper rear wheel toe and tracking.

Question 7

Some semi-independent rear suspensions have a solid inverted U-section channel connected between the trailing arms.

Accepted Answer

This is known as a "slapper bar" or "panhard bar" and is a commonly used component in semi-independent rear suspensions. It helps to maintain lateral stability and prevent excessive side-to-side movement of the trailing arms.

Question 8

In a MacPherson strut-type rear suspension, the struts are bolted to the top of the spindles.

Accepted Answer

In a MacPherson strut-type rear suspension, the struts are bolted to the top of the spindles.

Question 9

In a rear-wheel drive vehicle with a live-axle rear suspension, the acceleration torque tends to rotate the front of the differential downward.

Accepted Answer

In a rear-wheel drive vehicle with a live-axle rear suspension, the acceleration torque tends to rotate the front of the differential upward, not downward, due to the reaction forces acting on the axle.

Question 10

Variable rate rear springs may cause excessive rear body sway when driving on irregular road surfaces.

Accepted Answer

The answer of Variable rate rear springs may cause excessive...

Question 11

The adjustment link in a multilink rear suspension:

Accepted Answer

The adjustment link in a multilink rear suspension provides a rear wheel toe adjustment. It does not have any effect on fore-and-aft rear wheel movement, engine torque absorption, or rear wheel caster adjustment.

Question 12

Rear-wheel drive trucks and vans have independent rear suspension systems.

Accepted Answer

Rear-wheel drive trucks and vans typically have solid rear axles, which do not allow for independent rear suspension systems.

Question 13

On a live-axle, leaf-spring rear suspension system, improper rear wheel tracking may be caused by:

Accepted Answer

A broken spring center bolt can cause the axle to shift, leading to improper rear wheel tracking.

Question 14

Excessive rear chassis lateral movement may be caused by:

Accepted Answer

The answer of Excessive rear chassis lateral movement may be...

Question 15

Technician A says decreased steering effort may be caused by sagged rear springs. Technician B says sagged rear springs may cause fast steering wheel return. Who is correct?

Accepted Answer

The answer of Technician A says decreased steering effort may...

Question 16

Independent rear suspensions have all of these advantages EXCEPT:

Accepted Answer

Independent rear suspensions actually improve directional stability, not decrease it.

Question 17

Reduced rear curb riding height may cause damaged rear strikeout bumpers.

Accepted Answer

Reduced rear curb riding height means the lowest point of the rear of the vehicle is now closer to the ground, increasing the risk of hitting objects on the road, such as curbs or speed bumps. This can cause damage to the rear strikeout bumpers, which are designed to protect the vehicle from such impacts.

Question 18

A defective track bar may cause rear chassis waddle.

Accepted Answer

The track bar is a suspension component that helps to prevent lateral movement of the rear axle. A defective track bar can cause the rear chassis to waddle or sway side to side, especially during cornering or over bumps.

Question 19

Rear axle tramp is caused by:

Accepted Answer

Rear axle tramp is caused by the transmission of drive line torque through the drive shaft, which can cause the rear axle to oscillate or "bounce" uncontrollably. A bent rear control arm or irregular rod surfaces could cause other issues with the suspension, but they do not directly cause rear axle tramp. Improper rear wheel alignment could contribute to other handling issues, but it would not cause rear axle tramp on its own.

Question 20

In a semi-independent rear suspension system, some  individual wheel movement is provided by:

Accepted Answer

The U-section channel and integral stabilizer bar in a semi-independent rear suspension system allow for some individual wheel movement, providing a balance between independent and dependent suspension characteristics.

Quiz 7: Rear Suspension Systems

Rear axle tramp occurs during:

Some independent rear suspension systems have a ball joint that attaches the lower control arm to the bottom of the knuckle.

In a multilink rear suspension system, dual upper links connect the top of the strut to the chassis.

Rear axle tramp occurs during hard braking.

Technician A says when measuring rear suspension curb riding height, the vehicle should be parked on a level floor. Technician B says excessive rear curb riding height causes reduced directional stability. Who is correct?

Technician A says in a semi-independent rear suspension system, improper rear wheel toe and tracking may be caused by a bent trailing arm. Technician B says on a semi-independent rear suspension system, improper rear wheel toe and tracking may be caused by a bent inverted U-channel. Who is correct?

Some semi-independent rear suspensions have a solid inverted U-section channel connected between the trailing arms.

In a MacPherson strut-type rear suspension, the struts are bolted to the top of the spindles.

In a rear-wheel drive vehicle with a live-axle rear suspension, the acceleration torque tends to rotate the front of the differential downward.

Variable rate rear springs may cause excessive rear body sway when driving on irregular road surfaces.

The adjustment link in a multilink rear suspension:

Rear-wheel drive trucks and vans have independent rear suspension systems.

On a live-axle, leaf-spring rear suspension system, improper rear wheel tracking may be caused by:

Excessive rear chassis lateral movement may be caused by:

Technician A says decreased steering effort may be caused by sagged rear springs. Technician B says sagged rear springs may cause fast steering wheel return. Who is correct?

Independent rear suspensions have all of these advantages EXCEPT:

Reduced rear curb riding height may cause damaged rear strikeout bumpers.

A defective track bar may cause rear chassis waddle.

Rear axle tramp is caused by:

In a semi-independent rear suspension system, some individual wheel movement is provided by: