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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Michigan CDL knowledge test. The MI CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Michigan CDL Manual. Take this MI CDL practice test now to prepare for the actual air brakes test!
1.
The alcohol evaporator:
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ensures the coolant temperature gauge remains in the normal range.
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helps to reduce the risk of ice in air brake valves and other parts in cold weather.
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eliminates the need for daily air tank drainage.
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2.
The total stopping distance for vehicles with air brake systems is made up of __ different factors.
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2
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4
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3
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3.
Typically an air system is fully-charged at:
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75 psi
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125 psi
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25 psi
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4.
Most heavy-duty vehicles use:
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single air brake systems.
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dual air brake systems.
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triple air brake systems.
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5.
Which of the following is not a braking system on a truck?
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Parking brake
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Service brake
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Steering brake
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6.
Under a pressurized system, the radiator cap:
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should never be hot.
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should never be removed until the system has cooled.
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should be removed when the coolant is hot.
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7.
If your truck catches fire, the first thing you should do is to:
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pull into a service station and call for help.
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pull off the road and park in an open area.
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get the vehicle off the road and park near other vehicles.
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8.
Your vehicle has air brakes. To stop, you should:
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pull the parking brake control knob out.
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release the accelerator, push in the clutch, and shift to Neutral at the same time.
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push the brake pedal down.
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9.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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50 psi
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100 psi
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150 psi
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10.
An alcohol evaporator:
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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used to reduce the chance of the front wheels skidding.
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protects the air brake system from too much pressure.
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