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South Dakota 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 South Dakota 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.
Brake linings should be:
Loose.
Free of oil.
Soft.
3.
Emergency brakes:
Are not required on vehicles with air brakes.
Are required only on buses.
Are required on all vehicles.
4.
If the brake pads rub against the brake drums and create too much heat:
The brakes will stick.
The brakes will become extra sensitive.
The brakes may stop working.
The air compressor will kick on to cool the brakes.
5.
What kind of force do emergency brakes use?
Air pressure
Mechanical
Heavy
6.
Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.
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