99
Chapter 30
End of Chapter Review Questions Answer Key
1. Which of the following statements best describes how ABS prevents brake lockup?
2. Which of the following provides the most critical input signal to the ABS module?
3. Which of the following best describes the type of sensor used to signal wheel speed
data to an ABS module?
4. Which of the following is the main output device on a truck ABS?
5. Which of the following is the control component in an ABS modulator valve?
6. Which of the following is likely to occur if an ABS ceases to function?
7. Why do some ABS ECUs contain two microprocessor units?
100
8. Which of the following is true of the ABS tractor warning light?
9. When does an ATC light illuminate?
10. Which of the following ABS channel configurations is required in a truck equipped
with stability control electronics (SCE)?
11. What is the maximum modulation speed of a typical air brake ABS?
12. Technician A says that air brake ABS can be modulated at much higher speeds than
hydraulic ABS because of the compressibility of air. Technician B says that a truck
per second. Who is correct?
13. Before testing a dual-drive axle truck equipped with ATC on a chassis dynamometer,
what should be done?
14. An ABS light displays fault codes that are not interpreted in the OEM service
literature. Which of the following is the likely problem?
101
15. Technician A says that in a true EBS, the brake pedal does no more than produce an
electrical signal to the EBS control module. Technician B says that current FMVSS
121 legislation requires that when EBS is used on North American highways, it is in
addition to pneumatic controls. Who is correct?
16. When is a tractor ABS self test performed?