Free Delaware CDL Air Brakes Practice Test 2023

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 2021 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
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
Under normal conditions, in order to engage the parking brakes the driver should:
Emergency stab braking is:
Excessive heat caused by using your brakes too often can also cause:
When testing air leakage rates for single vehicles, initial loss rate should be less than:
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?
When does the air compressor governor allow air to start pumping?
If you must make an emergency stop, you should brake so you:
Why is manually adjusting automatic slack adjusters dangerous?
If your truck has a dual air brake system, and one of the systems is low on pressure:
The parking brake should not be used when wet in freezing temperatures, or:
In case of emergency stops, drivers should:
Under normal braking conditions, the vehicle:
The most common problem found in roadside inspections is:
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
Pushing the brake pedal down harder __________.
If one air system is very low on pressure _______.
Stab braking should only be used:
Why do air brakes take longer to stop than hydraulic brakes?
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?
To test the parking brake you should _______.