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.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
2.
An automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
3.
To test the vehicle's service brakes, move the vehicle:
4.
An air brake system is fully charged at what psi?
5.
The main factor in causing brake fade is:
6.
To stop the vehicle, air brakes systems use:
7.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
8.
When parking a vehicle with a modulating control valve ________.
9.
When brakes are applied, the brake shoes will press against the:
10.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
11.
Average stopping distance under normal conditions at 55 mph is:
12.
If air pressure is not built up within the correct amount of time, then:
13.
Pressing and releasing the brake pedal unnecessarily:
14.
Controlled braking is only possible _________.
15.
At what level will the low air warning usually take effect?
16.
Why should you check the brake adjustment often?
17.
How are brakes designed?
18.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
19.
The safety valve in the air compressor tank is set to open at _____.
20.
The belt of a belt-driven air compressor should be ________.
21.
Vehicles with air brakes _________.
22.
What is the purpose of a supply pressure gauge?
23.
To prevent too much pressure from building up in the system, what is installed?
24.
Water and oil _______.
25.
What is the function of a safety valve?