# Free Alabama CDL Air Brakes Practice Test 2022

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Alabama 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 Alabama 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 Alabama CDL practice test to get ready to pass your Alabama CDL Air Brake Test now.

Our CDL practice tests:
Based on 2022 AL commercial driver's license manual
Perfect for first-time, renewal applicants
AL CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
The safety valve discharges automatically at the pressure of:
2.
When inspecting air brakes:
3.
A low air pressure warning signal is ________.
4.
All air brake equipped vehicles have:
5.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
6.
A mechanical device that drops a low air warning into a drivers view is called a:
7.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
8.
The ____ shows how much pressure is in the air tanks.
9.
When performing the controlled braking method for an emergency stop, you are _________.
10.
When using a vehicle with air brakes, the parking needs to be used _______.
11.
What happens when your brake drums get very hot?
12.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
13.
When checking the air pressure buildup, pressure should build:
14.
The S-cam:
15.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
16.
Brake drums should not have cracks longer than what length?
17.
In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
18.
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
19.
Why do air brakes take longer to stop than hydraulic brakes?
20.
On large buses low pressure warning devices usually signal at ______.
21.
The belt of a belt-driven air compressor should be ________.
22.
Air tanks should be drained:
23.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
24.
The spring brakes of a tractor will come on when the air pressure falls within _______.
25.
What is the function of a safety valve?