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Braking will only occur if there is enough air in the tanks.
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You can brake 14 times before the air in the system runs out.
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You should continue to drive normally and check the brake system when it is convenient.
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You should continue driving, but turn the emergency flashers on to warn other motorists.
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Illinois CDL Permit Test - Air Brakes
(From the 2021 Illinois 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. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Illinois Commercial Driver’s License Study Guide. Questions come from chapters 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.
If the low pressure warning light comes on while you are driving:
2.
Air tank drains:
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Allow rain water to enter the tanks.
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Are used to drain water and oil from the tanks.
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Should never be opened.
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Must remain open while driving.
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3.
All air tanks must include:
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A drain valve.
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A lock.
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A trap door.
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A warning sticker.
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4.
How should you test the low pressure warning signal?
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Engage and disable the parking brake.
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Rapidly press and release the brake pedal.
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Open the rear shut-off valves.
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Uncouple and recouple all glad hands.
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5.
Using an Anti-Lock Braking System (ABS):
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Shortens stopping distance.
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Shortens brake response time.
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Provides less control.
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Provides more control.
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6.
When about to drive a vehicle with a dual brake system, a driver should:
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Let the vehicle warm up to ensure the fuel reaches the engine.
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Wait for air pressure to build in both the primary and secondary systems.
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Begin driving just after the engine starts.
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Pump the pedal about 20 times to build pressure, then begin driving.
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