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Free Delaware CDL Air Brakes Test 2025
Part of mandatory Entry-Level Driver Training Course Based on 2025 DE commercial driver's license manualAvailable in EN, ES
30questions
6mistakes allowed
80%passing score
This practice test will help you prepare for the real DMV qualification to drive a vehicle with air brakes and help you to become a better driver starting today.
The 30 multiple-choice questions is based directly on the Delaware Commercial Driver License Manual and applicable Delaware laws. You should also pay attention to the hint and explanation provided with each question, as these will make you more prepared for your actual exam. Practice as often as necessary until you achieve a passing score and feel comfortable with the information. Good luck, keep practicing, and drive safely!
Perfect for
- First-time DE CDL and CLP applicants
- CDL holders adding endorsements
- DE CDL renewal applicants
What to expect on the actual exam
| How many questions | 25 |
|---|---|
| How many correct answers to pass | 20 |
| Passing score | 80% |
Unlock all 1,500+ exam-like questions for Delaware. Pass Guarantee
Become a member to unlock our extensive library of 1,500+ exam-like questions and get your Delaware ELDT certification online. Official FMCSA-approved national Entry-Level Driver Training provider.
Pass the first time, guaranteed
List of questions (classic view)
- At what measurement is the safety valve USUALLY set to open?
- The tractor protection valve
- Which of the following is NOT part of the drum brake?
- Which of the following are true about a dual air brake system?
- Which vehicles must have low air pressure warning signals?
- An antilock braking system (ABS)
- Which of the following can cause brakes to fade or fail?
- When should you use the parking brake?
- Which of the following should you do before leaving your vehicle unattended?
- How would you check your truck's slack adjusters?
- What is the best way to test your vehicle's low air pressure warning signal?
- The purpose of a supply pressure gauge is
- How do brakes work on a long, steep downgrade?
- Which of the following is NOT part of the air brake system?
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- Why must you pass a knowledge test on air brakes?
- Spring brakes are
- After the initial pressure drop, the maximum acceptable leakage rates per minute are
- If the air tanks are not drained,
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer with an antilock braking system (ABS)?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- Slack adjusters are
- Under which conditions are front wheel brakes good to use?
- When should you drain your air tanks?
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the
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