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Free Colorado CDL Air Brakes Test 2024
Part of mandatory Entry-Level Driver Training Course Based on 2024 CO commercial driver's license manualAvailable in EN, ES
30questions
6mistakes allowed
80%passing score
Your knowledge of air brakes will be tested with 30 multiple-choice questions that will make you more prepared for your upcoming DMV exam, and help you to become a safer driver.
Each question is based on information you can find in the Colorado Commercial Driver License Driver Manual and applicable Colorado laws. We recommend reviewing the explanation that accompanies each question so that you will be prepared to answer future questions about the material covered in this practice exam.
Good luck, practice until you feel confident, and drive safely!
Perfect for
- First-time CO CDL and CLP applicants
- CDL holders adding endorsements
- CO 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 Colorado. Pass Guarantee
Become a member to unlock our extensive library of 1,500+ exam-like questions and get your Colorado ELDT certification online. Official FMCSA-approved national Entry-Level Driver Training provider.
Pass the first time, guaranteed
List of questions (classic view)
- How would you check your truck's slack adjusters?
- Which of the following can cause brakes to fail or fade?
- Under which conditions are front wheel brakes good?
- When should you drain your air tanks?
- Which of the following should you do before leaving your vehicle unattended?
- Spring brakes are
- How do brakes work on a long, steep downgrade?
- The maximum leakage rates per minute after the initial drop are
- Why must you study air brakes in the state of Colorado?
- Which of the following is true about a dual air brake system?
- Why must air tanks be drained?
- The tractor protection valve
- Which of the following will be true about your brake function if your ABS fails?
- Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- What is the best way to test your vehicle's low air pressure warning signal?
- Slack adjusters are
- What is the best way to test if your vehicle's spring brakes come on automatically?
- When should you use the parking brake?
- The purpose of a supply pressure gauge is
- At what measurement is the safety valve USUALLY set to open?
- Which vehicles must have low air pressure warning signals?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- Which of the following is NOT part of the air brake system?
- Which of the following is NOT part of the drum brake?
- An anti-lock braking system (ABS)
- 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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