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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Indiana CDL knowledge test. The IN CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Indiana CDL Manual. Take this IN CDL practice test now to prepare for the actual air brakes test!
1. When using a fire extinguisher, you should stay:
as far away from the fire as possible.
at whatever distance you think is safe.
at least 10 feet away from the fire.
as close to the fire as possible, without getting burnt.
2. Overloading a vehicle with cargo can have negative effects on all of the following except:
Speed control
Weight limits
3. If your ABS fails:
you will still have normal brake functions.
the first step is to get the vehicle off the road and stop.
your tires might grab unexpectedly and you could lose control.
you will have no brake function, and could lose control.
4. Before starting down a hill, you should:
slow down and shift to a lower gear.
apply the brakes hard.
look for an escape route.
release the accelerator and shift to Neutral at the same time.
5. Before leaving your vehicle unattended, you should:
Remove the keys.
Chock the wheels.
Apply the parking brake.
All of the above.
6. When driving a 60 foot truck at 35 mph in ideal conditions, you should keep at least _______ of space in front of you.
6 seconds
12 seconds
5 seconds
4 seconds
7. The s-cam:
helps ensure that air flows to all trailers.
forces the brake shoes away from one another and presses them against the inside of the brake drum.
pulls the brake shoes away from the drum.
All of the above.
8. To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
All trucks have air brakes.
If you don't pass the air brakes test, you can't get a CDL.
If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
If you don't, you will only receive a CDL permit.
9. Which of the following is NOT part of the drum brake?
Safety valve
Brake drum
Return spring
10. If your tires are hot, you should NOT:
stop to let the tires cool down.
let air out of the tires so the pressure goes back to normal.
once the tires have cooled down, make another stop to check the tires.
drive until you correct the cause of the overheating.
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IN Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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