310T Steering, Suspension and Brake Systems| Updated
New edi on| 2025/2026
The height of the fi h wheel from the ground should:
a) not allow the trailer height to exceed 13'6" (4.1 m).
b) be between 3'6" and 60" (1.1 and 1.5 m).
c) provide adequate swing clearance between the tractor and the trailer.
d)be capable of being varied by adjus)ng air or hydraulic pressure.
a) not allow the trailer height to exceed 13'6" (4.1 m).
Which vehicle dynamic control system adds a steering angle and lateral accelera)on sensor to
ABS architecture?
a) Rollover stability control
b) Automa)c trac)on control
c) Collison avoidance system
d) Direc)onal stability control
a) Rollover stability control
Consider a tractor and semitrailer combina)on vehicle. If the tractor were equipped with an
ABS but the trailer was not, which of the following situa)ons would most likely occur under a
hard braking condi)on?
a) Understeer
b) Trailer swing-out
c) Jackknife
d) Oversteer
b) Trailer swing-out
What type of electrical signal is supplied to the ABS ECU by wheel speed sensors?
a) Digital
b) Serial data J-1939
c) Low voltage alterna)ng current (AC)
d) Low voltage direct current (DC)
,c) Low voltage alterna)ng current (AC)
ABS modulator valves contain:
a) only an electrically controlled exhaust valve.
b) only an electrically controlled air inlet valve.
c) a normally closed inlet and exhaust valve.
d) an electrically controlled inlet and exhaust valve.
d) an electrically controlled inlet and exhaust valve.
Trac)on control systems minimize wheel slip by:
a) modula)ng brake pressure to wheels with trac)on.
b) selec)vely applying brakes to slipping or spinning wheels.
c) selec)vely braking slipping wheels and reducing engine power.
d) reducing engine power when the wheels spin.
c) selec)vely braking slipping wheels and reducing engine power.
A lateral accelera)on sensor, or "G" sensor, is a system input sensor used only by the:
a) automa)c trac)on control (ATC) system.
b) direc)onal stability control (DSC) system.
c) ABS.
d) roll stability control (RSC) system.
d) roll stability control (RSC) system
A yaw sensor is an input used by the direc)onal stability control system to:
a) measure the rota)on of a tractor around the trailer king pin.
b) measure the difference between "steered" and actual vehicle direc)on.
c) detect whether the vehicle's center of gravity has become too high.
d) measure the steering wheel angle.
b) measure the difference between "steered" and actual vehicle direc)on.
Which of the following is the air gap se?ng for a typical truck wheel speed sensor?
a) There is no air gap se?ng.
b) 0.015"
,c) 0.005"
d) 0.010"
b) 0.015"
Which of the following test instruments is used to measure the output signal of a wheel speed
sensor?
a) An ohmmeter
b) An oscilloscope
c) A DC voltmeter
d) An AC voltmeter
a) An ohmmeter
Automa)c trac)on control differen)al braking will normally not occur when which of the
following condi)ons exist?
a) When only one wheel is spinning
b) Road speeds below 5 mph (8 kph)
c) Road speeds above 25 mph (40 kph)
d) Only when there is a defec)ve front wheel speed sensor
c) Road speeds above 25 mph (40 kph)
ABS works simply by electronically measuring individual __________.
a) Wheel ends
b) Lateral accelera)on
c) Yaw rate
d) Wheel speeds
d) Wheel speeds
What is one of the benefits of electronic control of brake force to wheel ends?
a) It increases the likelihood of shock load damage to driveline components a er a wheel spin.
b) It improves steering control and vehicle stability during panic braking and slippery condi)ons.
c) It does not default to normal braking when a fault is detected in the electronic control
system.
d) It increases the likelihood of "fishtailing" to improve steering control and direc)onal stability.
b) It improves steering control and vehicle stability during panic braking and slippery condi)ons.
, What is one of the benefits of the trac)on control feature of an ABS system?
a) It has a faster response than the driver to wheel lock-up and spin.
b) It reduces the likelihood of shock load damage to driveline components a er a wheel spin.
c) It defaults to normal braking when a fault is detected in the electronic control system.
d) It prevents )re flat spo?ng.
b) It reduces the likelihood of shock load damage to driveline components a er a wheel spin.
__________ braking takes place because the control logic inside the ECU can dis)nguish
between normal and abnormal decelera)on using an algorithm to calculate whether
decelera)ng wheels are likely to lockup.
a) Differen)al
b) Controlled
c) Rapid
d) Hard
b) Controlled
What color is the ABS indicator lamp?
a) Amber
b) Red
c) Blue
d) Green
a) Amber
Which of the following valves electronically changes applica)on pressure supplied to the brake
chambers?
a) Brake relay valve
b) Trac)on control valve
c) Modulator valve
d) Foot valve
c) Modulator valve
ABS trailer modules can receive power through pin __________ of the J560 trailer connector.
a) #1
New edi on| 2025/2026
The height of the fi h wheel from the ground should:
a) not allow the trailer height to exceed 13'6" (4.1 m).
b) be between 3'6" and 60" (1.1 and 1.5 m).
c) provide adequate swing clearance between the tractor and the trailer.
d)be capable of being varied by adjus)ng air or hydraulic pressure.
a) not allow the trailer height to exceed 13'6" (4.1 m).
Which vehicle dynamic control system adds a steering angle and lateral accelera)on sensor to
ABS architecture?
a) Rollover stability control
b) Automa)c trac)on control
c) Collison avoidance system
d) Direc)onal stability control
a) Rollover stability control
Consider a tractor and semitrailer combina)on vehicle. If the tractor were equipped with an
ABS but the trailer was not, which of the following situa)ons would most likely occur under a
hard braking condi)on?
a) Understeer
b) Trailer swing-out
c) Jackknife
d) Oversteer
b) Trailer swing-out
What type of electrical signal is supplied to the ABS ECU by wheel speed sensors?
a) Digital
b) Serial data J-1939
c) Low voltage alterna)ng current (AC)
d) Low voltage direct current (DC)
,c) Low voltage alterna)ng current (AC)
ABS modulator valves contain:
a) only an electrically controlled exhaust valve.
b) only an electrically controlled air inlet valve.
c) a normally closed inlet and exhaust valve.
d) an electrically controlled inlet and exhaust valve.
d) an electrically controlled inlet and exhaust valve.
Trac)on control systems minimize wheel slip by:
a) modula)ng brake pressure to wheels with trac)on.
b) selec)vely applying brakes to slipping or spinning wheels.
c) selec)vely braking slipping wheels and reducing engine power.
d) reducing engine power when the wheels spin.
c) selec)vely braking slipping wheels and reducing engine power.
A lateral accelera)on sensor, or "G" sensor, is a system input sensor used only by the:
a) automa)c trac)on control (ATC) system.
b) direc)onal stability control (DSC) system.
c) ABS.
d) roll stability control (RSC) system.
d) roll stability control (RSC) system
A yaw sensor is an input used by the direc)onal stability control system to:
a) measure the rota)on of a tractor around the trailer king pin.
b) measure the difference between "steered" and actual vehicle direc)on.
c) detect whether the vehicle's center of gravity has become too high.
d) measure the steering wheel angle.
b) measure the difference between "steered" and actual vehicle direc)on.
Which of the following is the air gap se?ng for a typical truck wheel speed sensor?
a) There is no air gap se?ng.
b) 0.015"
,c) 0.005"
d) 0.010"
b) 0.015"
Which of the following test instruments is used to measure the output signal of a wheel speed
sensor?
a) An ohmmeter
b) An oscilloscope
c) A DC voltmeter
d) An AC voltmeter
a) An ohmmeter
Automa)c trac)on control differen)al braking will normally not occur when which of the
following condi)ons exist?
a) When only one wheel is spinning
b) Road speeds below 5 mph (8 kph)
c) Road speeds above 25 mph (40 kph)
d) Only when there is a defec)ve front wheel speed sensor
c) Road speeds above 25 mph (40 kph)
ABS works simply by electronically measuring individual __________.
a) Wheel ends
b) Lateral accelera)on
c) Yaw rate
d) Wheel speeds
d) Wheel speeds
What is one of the benefits of electronic control of brake force to wheel ends?
a) It increases the likelihood of shock load damage to driveline components a er a wheel spin.
b) It improves steering control and vehicle stability during panic braking and slippery condi)ons.
c) It does not default to normal braking when a fault is detected in the electronic control
system.
d) It increases the likelihood of "fishtailing" to improve steering control and direc)onal stability.
b) It improves steering control and vehicle stability during panic braking and slippery condi)ons.
, What is one of the benefits of the trac)on control feature of an ABS system?
a) It has a faster response than the driver to wheel lock-up and spin.
b) It reduces the likelihood of shock load damage to driveline components a er a wheel spin.
c) It defaults to normal braking when a fault is detected in the electronic control system.
d) It prevents )re flat spo?ng.
b) It reduces the likelihood of shock load damage to driveline components a er a wheel spin.
__________ braking takes place because the control logic inside the ECU can dis)nguish
between normal and abnormal decelera)on using an algorithm to calculate whether
decelera)ng wheels are likely to lockup.
a) Differen)al
b) Controlled
c) Rapid
d) Hard
b) Controlled
What color is the ABS indicator lamp?
a) Amber
b) Red
c) Blue
d) Green
a) Amber
Which of the following valves electronically changes applica)on pressure supplied to the brake
chambers?
a) Brake relay valve
b) Trac)on control valve
c) Modulator valve
d) Foot valve
c) Modulator valve
ABS trailer modules can receive power through pin __________ of the J560 trailer connector.
a) #1
