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Alabama 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 or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Alabama 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 only the tractor is equipped with an Anti-Lock Braking System (ABS):
There is a decreased risk of jackknifing.
There is an increased risk of jackknifing.
The brakes will not work as effectively as they would without ABS.
The brakes will become more sensitive.
2.
If the spring brakes are activated, you should never:
Push down the brake pedal.
Open the hood.
Release air from the air storage tanks.
Open the door to the cab.
3.
When leaving a vehicle unattended, a driver should:
Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.
4.
The service brake system:
Applies and releases the brakes when you press the brake pedal while driving normally.
Applies and releases the parking brakes.
Applies and releases the emergency brake.
Applies and releases the axle brake.
5.
Friction inside a brake drum is caused when the brake shoes and linings:
Push against each other.
Separate from the axle.
Push against the inside of the drum.
Create excess heat.
6.
In cold weather, an alcohol evaporator should be checked and filled:
Once a week.
Every day.
Every hour.
Once a month.
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