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
Air brakes consist of ________.
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
When inspecting air brakes:
The reduced stopping power caused by overuse of the service brakes and excessive heat is called:
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
A dual air brake system ________.
To test the vehicle's service brakes, move the vehicle:
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?
The ____ shows how much pressure is in the air tanks.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
When your brake's main air pressure is lost ________.
If the low air warning comes on while you are driving, you should:
When brakes are applied, the brake shoes will press against the:
When checking the air pressure buildup, pressure should build:
After the initial pressure drop, air leakage for single vehicles should be less than:
The air compressor governor controls:
The parking brake should not be used when wet in freezing temperatures, or:
What tells the driver how much air pressure is in the air tanks?
How does the antilock brake system benefit the driver?
If air supply drops when driving, the tractor protection valve ________.
Stab braking should only be used:
You should use the parking brake _____________.
A warning to drivers behind you that the air brakes have been applied is the:
What is the purpose of an air storage tank?