CDL AIR BRAKES PRACTICE TEST - DELAWARE

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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Delaware CDL knowledge test. The DE CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Delaware CDL Manual. Take this DE CDL practice test now to prepare for the actual air brakes test!
1. To brake in a way that will keep your vehicle in a straight line and allow you to turn if it becomes necessary, you can use:
the "controlled braking" method.
the "controlled braking" method or the "stab braking" method.
the "stab braking" method.
None of the above.
2. The air storage tanks:
protects the tank and the rest of the system from too much pressure.
stop the compressor from pumping air.
are used to hold compressed air.
are connected to the engine through gears or a v-belt.
3. When the air system is fully-charged, the air loss rate for a single vehicle with the engine off should be less than:
4 psi in one minute.
3 psi in one minute.
2 psi in 30 seconds.
2 psi in one minute.
4. Most heavy-duty vehicles use:
pump-the-brake systems.
dual air brake systems.
single air brake systems.
triple air brake systems.
5. Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
for 3 days
for one day
for one stop
several times
6. Spring brakes are usually held back by:
the antilock braking system.
the brake pedal.
modulating control valves.
air pressure.
7. The tire load rating is stated:
on each axle.
inside the suspension system.
on the dashboard.
on the side of each tire.
8. The supply pressure gauges tell you how much air pressure:
is going to the brake chambers.
is in the air brakes.
you are applying to the brakes.
is in the air tanks.
9. The use of brakes on a steep downgrade is:
much more effective than the engine braking effect.
a supplement to the braking effect of the engine.
the main braking factor.
dangerous, and should be avoided at all costs.
10. The total stopping distance for vehicles with air brake systems is made up of __ different factors.
3
2
4
5
 
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Frequently Asked Questions

  • If you are between the ages of 16 and 18 or are under 22 years old and receiving special education services through the Individualized Education Program (IEP), you qualify for the Graduated Driver License (GDL) program. This program allows you to obtain a learner’s permit. After completing 12 months of the GDL program, if your sponsor hasn't withdrawn their endorsement and your driving record is clear, your permit will convert to a class D license. 
  • If you are 18 years or older and choose not to participate in the GDL program, no sponsor is required, but you'll need to undergo an eye, knowledge, and road skills examination at the DMV to obtain your driver's license.
Apply in person at any Division of Motor Vehicles office in Wilmington, New Castle, Dover, or Georgetown. Verify where the nearest Delaware DMV office is and check its business hours before going. 

You need to bring specific documents: 

  • Proof of identity (e.g., certificate of birth or valid passport).
  • Two proof of Delaware residency, displaying your physical address and being valid within the last 60 days. Acceptable documents include utility bills, credit card statements, insurance policies, and employment records.
  • Proof of legal name change (if available).
  • Proof of passing a Certified Delaware Driver Education Course for those under 18.

For a guide on acceptable documents, you can refer to the official Document Selector Guide.
If you cannot read or speak English, translators are permitted during the DMV written test. The applicant is responsible for scheduling and paying a translator who will read the questions. However, the road sign section must be completed without any additional assistance.
To get ready for the Delaware DMV written test, start by reading the Delaware Driver’s Handbook. This manual has all the info you need to study for the exam: traffic signs, road rules, and safe driving practices. Then, check what you've learned with our free practice tests and consider signing up for DMV Premium to access additional resources!
The Delaware DMV test comprises 30 questions. It is designed to evaluate your knowledge of general driving laws, safe driving practices, and road signs. You should study the manual carefully to ensure your success on the first attempt.

You need an accuracy rate of 80% or higher, which means you are allowed up to 6 wrong answers. Be cautious and read thoroughly the questions.

New drivers in Delaware with a learner's permit face specific restrictions:
  • You must carry the permit with you when driving.
  • You and your passengers must wear safety belts.
  • You cannot use a cell phone while driving.
  • You cannot transport other people, except for an adult supervisor and one other passenger or your family members, for the first 12 months.
  • Under mandatory supervision, the supervisor must be a properly licensed parent, guardian, or approved adult driver, at least 25 years old, with a class D license for a minimum of 5 years.

For the first six months:
  • You must be supervised at all times.
  • The sponsor must certify that the permit holder has driven for 50 hours, including 10 hours of nighttime driving, and submit the certification to the Department of Education after the initial six months.

After the first six months:
  • You may drive unsupervised only between 6:00 a.m. and 10:00 p.m.
  • You may drive between 10:00 p.m. and 6:00 a.m. if supervised or for specific exceptions such as church, work, and school activities.
  • Passenger restrictions continue, allowing only the adult supervisor and one other passenger during unsupervised driving.
In Delaware, your learner's permit is valid for 6 months. You can extend it once before it expires by paying a fee. This waiting period ensures you have ample time to gain valuable driving experience and feel confident before the exam.

DE CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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