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Because the air gets old and needs to be replaced
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Because compressed air contains some water and the water collects in the tanks
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To allow for a change in pressure
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Wisconsin CDL Permit Test - Air Brakes
(From the 2021 Wisconsin 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 three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Wisconsin Commercial Driver’s 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.
Why should you regularly drain the air tanks?
2.
When parking, you should not use the parking brake if:
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The brakes are very hot.
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The brakes are very cold.
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There is snow on the ground.
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3.
Service brakes should:
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Be tested once a month.
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Only be tested by a trained mechanic.
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Be tested before every trip.
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4.
Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.
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10 psi
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25 psi
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50 psi
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100 psi
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5.
A driver can rely on front wheel braking to work:
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On dry roadways only.
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Under all conditions.
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Under all conditions, except for snow.
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6.
During an inspection, slack adjusters on S-cam brakes should not move more than:
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One foot.
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One centimeter.
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One inch.
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