Home › CDL Practice Tests › Air Brakes Questions › Question 207
After coupling, how can a driver get a basic indication that trailer ABS power and self-check are working where the system provides a lamp check?
- A.Apply the trailer brakes at highway speed and watch for smoke
- B.Disconnect the electrical cord and see if the brakes lock
- C.The lamp check can only be done by removing a wheel
- D.Cycle or connect power as directed and watch the trailer ABS lamp come on for its check and then go out if no fault is present
Correct answer
D. Cycle or connect power as directed and watch the trailer ABS lamp come on for its check and then go out if no fault is present
Why
The lamp sequence at power-up is the built-in confidence check for the trailer controller and bulb. A lamp that stays on, or never lights where it should, belongs on the defect report.
Manual topic: Air Brakes - ABS · From the Air Brakes practice bank (AB-207).