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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. When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
Using the trailer handbrake to provide air to the service line.
Pulling tractor forward until the fifth-wheel comes out from under the trailer.
Going to the rear of the rig.
2. Air tanks must be drained because:
if one air system is low on pressure, the rear brakes will not be operating fully.
compressed air usually has some water in it. The water can freeze in cold weather and cause brake failure.
when you push the brake pedal, air is let into each brake chamber.
3. If your vehicle catches fire, you should pull over:
at a service station.
near trees.
in an open area.
4. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
5. You are going down a steep grade. Once the vehicle is in the proper low gear, you should brake just hard enough to feel a slowdown, and then release the brakes when your speed has been reduced to ____ below your safe speed.
5 mph
15 mph
10 mph
6. Spring brakes:
are usually held back by air pressure.
will apply the brakes when a leak in the air brake system causes all the air to be lost.
All of the above.
7. When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
When you are conducting your pre-trip inspection.
Only while you are taking a rest break.
8. You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
you will be restricted to driving vehicles without air brakes.
you'll need to take another knowledge test about air brakes.
you'll have to immediately retake your test using another vehicle.
9. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
right; left
left; left
left; right
10. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
slow down and test your brakes.
activate your hazard lights and drive to the nearest place where you can stop.
pull off the road and stop immediately.
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MI CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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