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Antilock Braking Systems (ABS) — CDL Air Brakes Practice Test

Antilock Braking Systems (ABS)Question 1 of 17

17 questions in this topic · 17 drawn at random this round

How should you brake when driving a vehicle equipped with ABS?

CDL Manual — Air Brakes

Questions are based on the official CDL manual (AAMVA model) used by state DMVs. The real CDL knowledge test is given in English — federal rules (FMCSA, 49 CFR 391.11) require English proficiency to drive commercially; our Chinese & Spanish are study aids. Some states also offer the written test in other languages (see the per-state table).

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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.

  1. 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

  2. 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

  3. 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