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Indiana CDL Permit Test - Air Brakes

Number of questions: 25
Passing score: 20
Directions: This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Indiana Commercial Driver License Manual. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
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Passing grade —
5 or fewer errors
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1.
When inspecting your brakes, a slack adjuster should move ____ from where it is attached to the push rod.
At least three inches
More than two inches
Up to five inches
No more than one inch
2.
A dual air brake system:
Has a single air brake system, but uses two sets of controls.
Has one air brake system for each side of the truck.
Has two brakes for each wheel.
Has two separate air brake systems, but uses a single set of controls.
3.
Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:
Are necessary for the proper function of the air brake system.
Should be added if low.
Should be removed regularly.
Are not concerns.
4.
What is removed when an air tank is drained?
Water and oil
Ammonia
Wood
Chlorine
5.
Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).
Bluetooth.
GPS.
A rear back-up camera.
6.
To stop a vehicle using air brakes:
The brake pedal should be depressed.
The brake pedal should be lifted.
The brake knob should be pulled out.
The brake knob should be pushed in.
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