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Each system has separate air tanks, hoses, and lines.
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The systems share air tanks, but each has its own separate hoses and lines.
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Each system uses the same lines and hoses.
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One system is the main braking system and a second system is ready to be used if the first one fails.
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Indiana CDL Permit Test - Air Brakes
(From the 2021 Indiana CDL driver handbook)
| 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 four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Indiana 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.
Passing grade —
5 or fewer errors
advertising
1.
In a dual air brake system:
2.
When only the tractor is equipped with an Anti-Lock Braking System (ABS):
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There is a decreased risk of jackknifing.
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There is an increased risk of jackknifing.
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The brakes will not work as effectively as they would without ABS.
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The brakes will become more sensitive.
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3.
If the spring brakes are activated, you should never:
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Push down the brake pedal.
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Open the hood.
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Release air from the air storage tanks.
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Open the door to the cab.
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4.
If the spring brakes are on, you should:
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Not use the brake pedal.
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Press the accelerator.
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Move the steering wheel.
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Be especially careful because the brakes may fail.
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5.
How is the parking brake released?
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By tapping the brake pedal three times
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By pushing in the brake control knob
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By starting the vehicle
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By tapping the accelerator twice
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6.
In a dual air brake system, a leak in one system:
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Always means there are leaks in both systems.
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May not affect the other system.
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Is not something to worry about.
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Will also affect the other system.
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