Exam 30: Abs and Ebs

Which of the following describes what is meant by a split-coefficient stop?

Where is a pulse wheel generator used in a truck ABS system?

Which of the following could be considered ABS outputs?

In a 4S/4M ABS,which wheels have wheel speed sensors fitted?

If a battery charger is used to power up a dynamic test of a trailer ABS circuit,which of the following can result?

Technician A says that ABS modulation cycle rates are much higher in truck pneumatic brake systems than hydraulic brake systems.Technician B says that ABS pneumatic modulation cycle rates peak at about 7 times per second.Who is correct?

Which of the following ABS configurations is most commonly used on tandem drive highway tractors today?

Technician A says that when an electronic braking system (EBS)is used on an air brake system,the control circuit is pneumatic and the actuator circuit is electronic-over-electric.Technician B says that when EBS is used at this moment in time in North America,it is required to have full FMVSS-121 redundancy.Who is correct?

How can truck ABS failure codes be displayed?

Technician A says that as wheelbase becomes shorter in a highway truck,its resistance to yaw is reduced.Technician B says that an ABS add-on called directional stability control uses the brake system to avoid tracking yaw.Who is correct?

Which of the following terms have the same meaning as reluctor wheel?

Technician A says that in a 6S/6M highway tractor ABS,two modules are required to manage the system.Technician B says that a 6S/6M highway tractor ABS is required for most accident avoidance electronics.Who is correct?

Technician A says that as the rotational speed of an ABS monitored wheel increases,the voltage generated by the wheel speed sensor also increases.Technician B says that the frequency produced by a truck ABS wheel speed sensor when it is at a standstill should be close to 400 Hz.Who is correct?

Which of the following statements regarding the illumination of a truck ABS dash light is true?

A current truck or trailer ABS system is required to have FMVSS 121 redundancy.What does redundancy mean in this context?

Which of the following accounts for slower modulation frequencies in truck pneumatic brake systems than equivalent hydraulic brake systems?

Technician A says that when the truck brakes are applied,the more severe the braking force,the greater the role played by the front brakes.Technician B says that it is mandatory for current trucks to include the front brakes in the ABS loop.Who is correct?

When a loss of signal occurs in one wheel speed sensor on a typical truck pneumatic ABS system,which of the following is most likely to result?

When a truck ABS system is described as 6S/4M configured,how many modulator valves are used in the system?

Technician A says that all ABS circuits are tested during a start-up self test.Technician B says that if all the components checked during an ABS self test are verified functional,the dash ABS light remains illuminated.Who is correct?