Question 1

Which of the following explains why you have to hold some types of air suspension height control valves in an off-horizontal position for up to 15 seconds before it responds to the movement?
A) valve is defective
B) cold weather operation
C) hydraulic reaction delay
D) pneumatic-actuated reaction delay

Accepted Answer

Hydraulic reaction delay

Question 2

When a truck chassis is equipped with a rollover stability control (RSC)system,which data bus electronic system is it usually integrated with?
A) engine controller
B) chassis controller
C) transmission controller
D) ABS/ATC controller

Accepted Answer

Rollover Stability Control (RSC) systems are typically integrated with the ABS/ATC (Anti-lock Braking System/Automatic Traction Control) controller. This integration allows the RSC system to utilize the braking system to help prevent rollovers by adjusting the speed of individual wheels.

Question 3

Which of the following shop tools would most likely be required to remove old rubber bushings from an equalizing beam type suspension?
A) hammer and chisel
B) oxy-acetylene cutting torch
C) rosebud
D) 50-ton hydraulic press

Accepted Answer

A 50-ton hydraulic press is typically used to remove old rubber bushings from heavy-duty suspension components like those found in an equalizing beam type suspension, due to the need for significant force to push out the old bushings.

Question 4

Technician A says that an RSC system can request over the chassis data bus a reduction of engine torque.Technician B says that a driveline retarder can be actuated as a result of a RSC request over the data bus.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both statements by Technician A and Technician B are correct. An RSC (Roll Stability Control) system can indeed request a reduction of engine torque over the chassis data bus to help stabilize the vehicle. Additionally, an RSC system can also request the actuation of a driveline retarder over the data bus as part of its strategy to prevent rollovers or improve stability, making both technicians correct.

Question 5

Which of the following is a notably reliable tattletale of suspension problems before they result in a complete failure?
A) driver complaints
B) tire wear patterns
C) cracks in frame
D) increased air compressor cycling

Accepted Answer

Tire wear patterns are a reliable indicator of suspension problems because uneven or abnormal wear can suggest issues with the suspension system's alignment, shocks, or other components.

Question 6

Technician A says that when installing a multi-leaf spring pack,the U-bolts should be torqued over the axle saddle before connecting the spring pin.Technician B says that the weight should be off the spring before torquing a U-bolt.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both technicians are incorrect. The U-bolts should be torqued after the spring pin is connected and with the vehicle's weight on the springs to ensure proper alignment and tension.

Question 7

Technician A says that body-bound bolts used in some suspensions are almost always SAE Grade 5 rated because they need to flex.Technician B says that it is generally safe to replace Huck fasteners used to mount suspension components with SAE Grade 5 fasteners.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Body-bound bolts are designed to flex, and SAE Grade 5 bolts are specifically designed for this purpose. Huck fasteners, on the other hand, are not designed to flex and should not be replaced with SAE Grade 5 fasteners.

Question 8

Which of the following is the least recommended method of checking axle alignment on a truck or trailer?
A) tram gauge and straight-edge
B) light and laser beam alignment
C) computer controlled sensor systems
D) all have equal accuracy

Accepted Answer

Tram gauge and straight-edge methods, while traditional, are generally considered less accurate and more time-consuming compared to modern methods like light and laser beam alignment or computer-controlled sensor systems. These newer technologies offer more precision and efficiency.

Question 9

While lubricating a rear suspension with an air-actuated grease gun,one spring pin will not take grease.Which of the following should be done first?
A) remove weight from suspension and try with a hand grease gun
B) heat the spring with a rosebud
C) remove weight from the suspension and hammer on eye while pumping grease
D) replace the mainleaf

Accepted Answer

The first step should be to remove weight from the suspension and try with a hand grease gun, as this can often resolve the issue without needing to resort to more drastic measures. This method is less invasive and can help in ensuring that the grease is properly applied.

Question 10

A multi-leaf spring pack on a truck front suspension has a single broken leaf.If you observe what the OEM recommends,which of the following would be correct procedure?
A) rebuild the spring pack,replacing the broken leaf
B) replace the spring pack with the broken leaf with a new spring pack
C) replace both front axle spring packs
D) replace all springs on the vehicle,front and rear

Accepted Answer

The correct procedure, according to most OEM recommendations, is to replace both front axle spring packs to ensure even suspension performance and avoid potential handling issues. Replacing only the spring pack with the broken leaf could lead to uneven wear and handling problems due to the difference in spring characteristics between the old and new pack.

Quiz 26: Suspension Systems

Which of the following explains why you have to hold some types of air suspension height control valves in an off-horizontal position for up to 15 seconds before it responds to the movement?

When a truck chassis is equipped with a rollover stability control (RSC) system,which data bus electronic system is it usually integrated with?

Which of the following shop tools would most likely be required to remove old rubber bushings from an equalizing beam type suspension?

Technician A says that an RSC system can request over the chassis data bus a reduction of engine torque.Technician B says that a driveline retarder can be actuated as a result of a RSC request over the data bus.Who is correct?

Which of the following is a notably reliable tattletale of suspension problems before they result in a complete failure?

Technician A says that when installing a multi-leaf spring pack,the U-bolts should be torqued over the axle saddle before connecting the spring pin.Technician B says that the weight should be off the spring before torquing a U-bolt.Who is correct?

Technician A says that body-bound bolts used in some suspensions are almost always SAE Grade 5 rated because they need to flex.Technician B says that it is generally safe to replace Huck fasteners used to mount suspension components with SAE Grade 5 fasteners.Who is correct?

Which of the following is the least recommended method of checking axle alignment on a truck or trailer?

While lubricating a rear suspension with an air-actuated grease gun,one spring pin will not take grease.Which of the following should be done first?

A multi-leaf spring pack on a truck front suspension has a single broken leaf.If you observe what the OEM recommends,which of the following would be correct procedure?