Free New Hampshire CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The New Hampshire CDL Air Brake test 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 CDL practice test packs are based on the NH 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 NH CDL Practice Test to get ready to pass the New Hampshire CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 NH commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
NH 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?
The safety valve discharges automatically at the pressure of:
A low pressure warning signal could be __________.
To test the vehicle's service brakes, move the vehicle:
In a controlled braking emergency:
If you must make an emergency stop, you should brake so you:
What negatively affects the braking power of a spring brake?
The type of brakes that clamp the rotor between the brake shoes is:
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
When using a vehicle with air brakes, the parking needs to be used _______.
If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ____ mph.
After the initial pressure drop, air leakage for single vehicles should be less than:
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 most common problem found in roadside inspections is:
With air brake vehicles, the parking brakes should be used:
To test the parking brake, stop the vehicle, put the parking brake on, and:
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
On newer vehicles what color is the parking brake knob?
The service brake system ________.
Why does a heavily loaded vehicle need a longer distance to stop?
Why do air brakes take longer to stop than hydraulic brakes?
Automatic adjusters should ________.
How does the antilock brake system benefit the driver?
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
If your brakes are wet, what should you do to dry them quicker?