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Using Air Brakes — CDL Air Brakes Practice Test

Using Air BrakesQuestion 1 of 30

33 questions in this topic · 30 drawn at random this round

With air brakes, what is "brake lag"?

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 Using Air Brakes practice set has 33 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 Using Air Brakes bank with the correct answer and an explanation. The practice quiz above draws 30 questions at random from the same bank.

  1. How should you make a normal stop with air brakes?

    • Push the brake pedal down and control the pressure for a smooth, safe stop — Correct answer
    • Press the pedal fully to the floor as fast as possible
    • Pump the pedal rapidly the whole time
    • Apply the parking brake instead of the pedal

    Explanation: Push the brake pedal down and control the pressure so the vehicle comes to a smooth, safe stop. English term: service brake（行车制动 / freno de servicio）.

    Handbook: Using Air Brakes — Normal Stops

  2. On a normal stop with a manual transmission, when should you push the clutch in?

    • Not until the engine rpm is down close to idle — Correct answer
    • As soon as you first touch the brake pedal
    • Only after the vehicle has fully stopped
    • Halfway through braking, regardless of rpm

    Explanation: Do not push the clutch in until the engine rpm is down close to idle; when stopped, select a starting gear. English term: service brake（行车制动 / freno de servicio）.

    Handbook: Using Air Brakes — Normal Stops

  3. After you come to a normal stop, what should you do with the transmission?

    • Select a starting gear — Correct answer
    • Leave it in the highest gear
    • Keep the clutch pushed in indefinitely
    • Shift into reverse

    Explanation: When stopped, select a starting gear so you are ready to move off again. English term: service brake（行车制动 / freno de servicio）.

    Handbook: Using Air Brakes — Normal Stops