# Free Louisiana CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Louisiana 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 Louisiana CDL Book. 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 Louisiana CDL Practice Test to get ready to pass the Louisiana CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 LA commercial driver's license manual
Perfect for first-time, renewal applicants
LA CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
2.
Air tanks need to be drained ______.
3.
Emergency stab braking is:
4.
A mechanical device that drops a low air warning into a drivers view is called a:
5.
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
6.
In a controlled braking emergency:
7.
If you must make an emergency stop, you should brake so you:
8.
While applying the brakes, what tells the driver how much air pressure is being used?
9.
When increased application pressure to maintain the same speed becomes necessary, you should ______.
10.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
11.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
12.
If the spring brakes are on, when should you push the brake pedal?
13.
Under normal braking conditions, the vehicle:
14.
With air brake vehicles, the parking brakes should be used:
15.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
16.
On newer vehicles what color is the parking brake knob?
17.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
18.
Brake drums or discs _______.
19.
Air tanks should be drained:
20.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
21.
The spring brakes of a tractor will come on when the air pressure falls within _______.
22.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
23.
On a long or steep downgrade, how should vehicle speed be primarily controlled?
24.
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?
25.
To test the parking brake you should _______.