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2 psi
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4 psi
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6 psi
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Michigan CDL Permit Test - Air Brakes
(From the 2021 Michigan 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 Michigan 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.
During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.
2.
The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:
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Presses the brake pedal.
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Uses the emergency brake.
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Uses the trailer hand valve.
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3.
In a vehicle with dual parking control valves, a separate air tank can be used:
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To make the air brakes work more effectively.
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To temporarily release the spring brakes.
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To charge the brakes on the rear trailer.
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4.
Air storage tanks:
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Are not allowed on a vehicle.
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Hold compressed air for the brakes.
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Should be drained of excess air after every trip.
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5.
Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.
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Green
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Blue
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Yellow
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6.
When traveling down a steep downgrade:
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The air brakes should be used.
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The vehicle should be placed in a low gear and the driver should use engine braking.
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The driver should continually downshift instead of using the brakes.
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