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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.
Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
One half
One third
One fifth
2.
If the low air pressure warning signal comes on, you should:
Continue driving, but have the brakes repaired within a week.
Pull over and inspect the brakes.
Phone a mechanic while driving.
3.
Manual air tank drains should be:
Opened to drain the tanks after each day.
Left open while driving.
Sealed with glue.
4.
Brakes out of adjustment will:
Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
5.
When stopping in an emergency situation, you should:
Veer your trailer to the right and stop.
Stop in a straight line.
Veer your trailer to the left and stop.
6.
An air compressor governor controls:
When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.
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