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Oregon 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 three answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Idaho Commercial Driver’s 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.
You have made error so far
Passing grade —
5 or fewer errors
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1.
What color is the low air pressure warning light?
Green
Orange
Red
Purple
2.
Which type of brakes do most heavy-duty vehicles have?
Air brakes
Solid brakes
Liquid brakes
Gravity brakes
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.
Air brakes use ____ to function.
Compressed air
Liquid nitrogen
Carbon dioxide
5.
When the spring brakes are on, you should never:
Turn on the lights.
Turn off the vehicle.
Push down the brake pedal.
6.
If using the spring brakes while hauling a heavy load, a complete stop will:
Be impossible.
Take a long time.
Take a short amount of time.
Damage the brakes.
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