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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. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
anti-lock brakes.
a rear backup camera.
hydraulic brakes.
2. A dual air brake system:
has two separate air brake systems, which use a single set of brake controls.
has a single air brake system, which uses a single set of brake controls.
has two separate air brake systems, which use two separate sets of brake controls.
3. The supply pressure gauges tell you how much air pressure:
is in the air tanks.
you are applying to the brakes.
is going to the brake chambers.
4. With brake drums, if brakes become too hot:
your ABS will malfunction.
the brakes may stop working.
the brakes will supply too much power to the drive wheels.
5. If the spring brakes do not release when you push the trailer air supply control, you should:
check the electrical cables.
rev or lug the engine.
check the air line connections.
6. If stopped on a hill, how can you start moving without rolling back?
Partly engage the clutch before you take your right foot off the brake, put on the parking brake if necessary.
Release the parking brake before you have applied enough engine power to keep from rolling back.
Press on the gas pedal, even if you have to roll back a little.
7. The __________ keeps air from going out if the air compressor develops a leak.
emergency relay valve
tractor protection valve
one-way check valve
8. The tire load rating is stated:
inside the suspension system.
on each axle.
on the side of each tire.
9. Before transporting sealed loads, you should check that:
the seal numbers match the placard numbers.
the load can be inspected.
the load is properly secured.
10. If your vehicle is hydroplaning, you should:
use the brakes to slow down.
accelerate to get through the water as quickly as possible.
release the accelerator and push in the clutch.
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MI CDL Air Brakes Test

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