# 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.
To test air service brakes you should:
2.
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
3.
Air tanks need to be drained ______.
4.
How far should manual slack adjusters move before they need to be adjusted?
5.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
6.
The main factor in causing brake fade is:
7.
The application pressure gauge shows how much air pressure you:
8.
While applying the brakes, what tells the driver how much air pressure is being used?
9.
To stop the vehicle, air brakes systems use:
10.
When performing the controlled braking method for an emergency stop, you are _________.
11.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
12.
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
13.
The safety valve reduces pressure at ___ psi.
14.
The parking brake should not be used when wet in freezing temperatures, or:
15.
To stop the vehicle, the brake shoes and linings are pushed against:
16.
Repeatedly partially increasing and pressing the brake pedal may result in:
17.
Pushing the brake pedal down harder __________.
18.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
19.
The air compressor is connected to the engine through ______.
20.
Stab braking should only be used:
21.
Brake drums or discs _______.
22.
What is used to put alcohol into the system and reduce ice risk?
23.
The governor stops the compressor from pumping air at:
24.
A warning to drivers behind you that the air brakes have been applied is the:
25.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?