Free Maryland CDL Air Brakes Practice Test 2022

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

Our CDL practice tests:
Based on 2022 MD commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MD CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
The safety valve discharges automatically at the pressure of:
2.
A low air pressure warning signal is ________.
3.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
4.
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
5.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
6.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
7.
Where is the modulating control valve located on some vehicles?
8.
Another name for the brake pedal is the "foot valve", or:
9.
What is the purpose of an antilock braking system (ABS)?
10.
When using a vehicle with air brakes, the parking needs to be used _______.
11.
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
12.
The parking brake knob is usually:
13.
If the low air pressure warning light comes on, you should:
14.
What tells the driver how much air pressure is in the air tanks?
15.
The S-cam:
16.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
17.
The braking power of the spring brakes ______.
18.
Stab braking should only be used:
19.
How often should alcohol containers be checked during cold weather?
20.
On large buses low pressure warning devices usually signal at ______.
21.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
22.
The spring brakes of a tractor will come on when the air pressure falls within _______.
23.
On a long or steep downgrade, how should vehicle speed be primarily controlled?
24.
In a dual air brake system, one system will typically control the rear brakes, and the other:
25.
What does ABS stand for?