Free Delaware CDL Air Brakes Practice Test 2022

Do you need a Delaware Air Brakes endorsement or an L endorsement for your commercial driving license? The CDL Air Brake has some differences from other endorsements because your license will receive a mark of restriction if you fail the test. So having good preparation before exam day is very necessary. To ensure that our questions are relevant, all of our Delaware CDL Practice test questions are based on the Delaware CDL manual. Each question has a detailed explanation for you to thoroughly learn the format and the topic. Don't be afraid of having a restriction on your license. Let’s try our free CDL practice test to get ready to pass the Delaware CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2022 DE commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
DE CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
Air tanks need to be drained ______.
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
When testing air leakage rates for single vehicles, initial loss rate should be less than:
Normally during anti-lock braking, the driver:
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
Which braking system applies and releases the parking brakes when you use the parking brake control?
In most newer vehicles, the parking brake control will be:
When does the air compressor governor allow air to start pumping?
What must the air pressure be, at minimum, in both parts of a dual air brake system?
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
The trailer air supply knob is usually:
Under normal braking conditions, the vehicle:
The brake pedal in an air brake system _______.
If one air system is very low on pressure _______.
Brake drums should not have cracks longer than what length?
Why do air brakes take longer to stop than hydraulic brakes?
Spring brakes are applied:
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
What is the purpose of a supply pressure gauge?
In a dual air brake system, one system will typically control the rear brakes, and the other:
Vehicles with air brakes have pressure gauges connected to the _______.
If your brakes are wet, what should you do to dry them quicker?