Antilock Braking Systems (ABS) — CDL Air Brakes Practice Test
17 questions in this topic · 17 drawn at random this round
On newer vehicles, what should the ABS malfunction lamp do at start-up?
Session Progress
This CDL Air Brakes Antilock Braking Systems (ABS) practice set has 17 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL Air Brakes knowledge test to pass.
Sample questions
Three questions from the Antilock Braking Systems (ABS) bank with the correct answer and an explanation. The practice quiz above draws 17 questions at random from the same bank.
What does an Antilock Braking System (ABS) do?
- It keeps your wheels from locking up during hard braking — Correct answer
- It pumps extra air into the brake chambers
- It replaces the parking brake
- It shifts the transmission to a lower gear automatically
Explanation: ABS is a computerized system that keeps your wheels from locking up during hard brake applications. English term: ABS / Anti-lock Braking System（防抱死制动系统 / sistema antibloqueo de frenos）.
Handbook: Air Brakes ABS — what ABS is
What color are ABS malfunction lamps?
- Yellow — Correct answer
- Red
- Green
- Blue
Explanation: Vehicles with ABS have yellow malfunction lamps to tell you if something isn't working. English term: malfunction lamp（故障灯 / luz de mal funcionamiento）.
Handbook: Air Brakes ABS — malfunction lamp
Does ABS decrease or increase your normal braking capability?
- Neither — it is an addition to your normal brakes — Correct answer
- It greatly increases your braking power
- It decreases your braking power on dry roads
- It replaces your normal service brakes entirely
Explanation: ABS is an addition to your normal brakes — it does not decrease or increase your normal braking capability. It only activates when wheels are about to lock up. English term: service brake（行车制动 / freno de servicio）.
Handbook: Air Brakes ABS — addition to normal brakes