Free South Carolina CDL Air Brakes Practice Test 2022

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 2022 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
1.
An automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
2.
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
3.
Air tanks need to be drained ______.
4.
Excessive use of the service brakes results in overheating which can lead to:
5.
The supply pressure gauge shows how much pressure:
6.
Spring brakes will generally come on at:
7.
The application pressure gauge shows how much air pressure you:
8.
Brake fade is caused by:
9.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
10.
Another name for the brake pedal is the "foot valve", or:
11.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
12.
What is the purpose of an antilock braking system (ABS)?
13.
When using a vehicle with air brakes, the parking needs to be used _______.
14.
If the air compressor should develop a leak, what keeps the air in the tanks?
15.
The safety valve reduces pressure at ___ psi.
16.
What must the air pressure be, at minimum, in both parts of a dual air brake system?
17.
The S-cam:
18.
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
19.
The brake pedal in an air brake system _______.
20.
If one air system is very low on pressure _______.
21.
Why should air tanks be drained completely?
22.
The governor stops the compressor from pumping air at:
23.
Manual air tank drains require:
24.
Vehicles with ABS have malfunction lamps that are what color?
25.
What is the function of a safety valve?