Free South Carolina CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 SC commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
SC CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
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.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
On a long or steep downgrade, the foot brakes should be used:
Where is the modulating control valve located on some vehicles?
When performing the controlled braking method for an emergency stop, you are _________.
When the safety valve releases air this indicates ___________.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
The safety valve is set automatically when pressure is:
If your truck has a dual air brake system, and one of the systems is low on pressure:
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
After the initial pressure drop, air leakage for combination vehicles should be less than:
To stop the vehicle, the brake shoes and linings are pushed against:
Repeatedly partially increasing and pressing the brake pedal may result in:
Why does a heavily loaded vehicle need a longer distance to stop?
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
Brake linings should not be _______.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
The belt of a belt-driven air compressor should be ________.
What is used to put alcohol into the system and reduce ice risk?
The spring brakes of a tractor will come on when the air pressure falls within _______.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
What is a wig wag ?
In a dual air brake system, one system will typically control the rear brakes, and the other: