ABS on Combination Vehicles — CDL Combination Vehicles Practice Test
15 questions in this topic · 15 drawn at random this round
If your ABS malfunctions, what brakes do you still have?
Session Progress
This CDL Combination Vehicles ABS on Combination Vehicles practice set has 15 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL Combination Vehicles knowledge test to pass.
Sample questions
Three questions from the ABS on Combination Vehicles bank with the correct answer and an explanation. The practice quiz above draws 15 questions at random from the same bank.
All trailers and converter dollies built on or after what date are required to have ABS?
- March 1, 1998 — Correct answer
- January 1, 1975
- March 1, 2005
- July 1, 2010
Explanation: All trailers and converter dollies built on or after March 1, 1998 are required to have ABS; many built before that date were voluntarily equipped with it. English term: ABS / antilock braking system（防抱死制动系统 / sistema antibloqueo de frenos）.
Handbook: Combination ABS — Trailers Required to Have ABS
What color is the ABS malfunction lamp on a trailer?
- Yellow — Correct answer
- Red
- Blue
- Green
Explanation: Trailers have YELLOW ABS malfunction lamps; the lamp warns you if there is a fault in the trailer's antilock braking system. English term: malfunction lamp（故障指示灯 / luz de avería）.
Handbook: Combination ABS — Malfunction Lamps
On which side of a trailer is the yellow ABS malfunction lamp located?
- On the left side, on the front or rear corner — Correct answer
- On the right side, near the rear axle
- On the top of the trailer at the center
- Inside the tractor cab only
Explanation: Trailers have yellow ABS malfunction lamps on the LEFT side, either on the front or rear corner. English term: malfunction lamp（故障指示灯 / luz de avería）.
Handbook: Combination ABS — Malfunction Lamps