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Louisiana 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 Louisiana 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.
You have made error so far
Passing grade —
5 or fewer errors
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1.
Alcohol evaporators are:
Illegal.
Used to add alcohol to braking systems to prevent items from freezing.
Only allowed on vehicles carrying hazardous materials.
2.
If using spring brakes when hauling a heavy load, a complete stop will:
Be impossible.
Take a long time.
Take a short amount of time.
3.
When leaving your vehicle unattended:
The parking brake must be always be used.
The parking brake should never be used.
Windows in the cab should be lowered.
4.
When parked on a flat surface, you should:
Use wheel chocks to prevent your vehicle from moving.
Not use wheel chocks.
Use wheel chocks, but only if you have applied the parking brake.
5.
The parking brake in a newer vehicle is applied by:
Moving a lever to the right.
Pushing a yellow, diamond-shaped knob.
Pulling a yellow, diamond-shaped knob.
6.
What kind of brakes do most newer heavy-duty trucks use?
Single air brakes
Dual air brakes
Triple air brakes
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