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Free Oklahoma CDL Air Brakes Test 2025
Part of mandatory Entry-Level Driver Training Course Based on 2025 OK commercial driver's license manualAvailable in EN, ES
30questions
6mistakes allowed
80%passing score
As an Oklahoma truck driver, the best CDL to build your career is one with the fewest amounts of restrictions, which means taking an exam to drive commercial vehicles with air brakes. To get a CDL with an air brakes qualification, practice exams are the key to a great score on the real exam. This 30 multiple-choice question quiz, with carefully written explanations based on exactly what the Oklahoma Driver License Manual’s writers state you must know, cover all the basics and then some about air brakes, so take it as many times as you need to get a perfect score, and you’ll be on your way to that less restricted CDL today!
Perfect for
- First-time OK CDL and CLP applicants
- CDL holders adding endorsements
- OK 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 Oklahoma. Pass Guarantee
Become a member to unlock our extensive library of 1,500+ exam-like questions and get your Oklahoma ELDT certification online. Official FMCSA-approved national Entry-Level Driver Training provider.
Pass the first time, guaranteed
List of questions (classic view)
- Slack adjusters are
- Which of the following are true about a dual air brake system?
- At what measurement is the safety valve USUALLY set to open?
- 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?
- How would you check your truck's slack adjusters?
- Spring brakes are
- If the air tanks are not drained,
- After the initial drop, the maximum acceptable leakage rates per minute are
- Which of the following should you do before leaving your vehicle unattended?
- Which of the following is NOT part of the drum brake?
- When should you use the parking brake?
- Which of the following is NOT part of the air brake system?
- How do brakes work on a long, steep downgrade?
- An antilock braking system (ABS)
- Which of the following can cause brakes to fade or fail?
- Which vehicles must have low air pressure warning signals?
- When should you drain your air tanks?
- Under which conditions are front wheel brakes good?
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- What is the best way to test your vehicle's low air pressure warning signal?
- The tractor protection valve
- The purpose of a supply pressure gauge is
- 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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