# 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
Perfect for first-time, renewal applicants
NH CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
2.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
3.
The stop light switch:
4.
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
5.
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
6.
Spring brakes will generally come on at:
7.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
8.
With air brake vehicles, the parking brake should be used:
9.
To make sure that the spring brakes come on automatically, do all of the following except:
10.
When should the spring brakes activate?
11.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
12.
When your brake's main air pressure is lost ________.
13.
If the air compressor should develop a leak, what keeps the air in the tanks?
14.
What is a \"Wig Wag\"
15.
Pressing and releasing the brake pedal unnecessarily:
16.
Under normal braking conditions, the vehicle:
17.
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
18.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
19.
The brake pedal in an air brake system _______.
20.
You should avoid using the parking brake when _______.
21.
If you need to make an emergency stop, you should brake so that you can ________.
22.
Brake linings should not be _______.
23.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
24.
What is the function of a safety valve?
25.
What happens when pressure is put on the air brakes?