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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 Maine CDL knowledge test. The ME 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 Maine CDL Manual. Take this ME CDL practice test now to prepare for the actual air brakes test!
1. The stop light switch:
turns on the brake lights when you put on the air brakes.
warns you when the air supply pressure drops below 55 psi.
tells you when you need to use your parking brake instead of the service brake.
2. What is an important thing to remember about emergency braking?
Your natural response (hitting the brakes) is never the right solution.
You should never use stab braking.
Pushing down on the brake pedal as hard as you can will only keep the wheels locked up and cause a skid.
3. When should you downshift automatic transmissions?
When you start to get drowsy.
When going down steep grades.
Watch your tachometer, and downshift when your engine reaches the top of the range.
4. Supply pressure gauges tell you:
when the air pressure in the tanks falls below 60 psi.
how much pressure is in the air tanks.
how much air pressure you are applying to the brakes.
5. With air brake vehicles, you should use the parking brakes:
as little as possible.
only during the vehicle inspection test.
whenever you leave the vehicle unattended.
6. In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
100 to 120 psi
20 to 45 psi
10 to 20 psi
7. If you are being tailgated, you should:
increase your following distance.
move to the left lane.
speed up.
8. With a dual air brake system:
each system has its own air tanks, hoses and lines.
each system shares air tanks.
each system shares the same lines and hoses.
9. In a vehicle with a dual air brake system:
one system supplies air to the trailer.
both systems typically operate the regular brakes on the rear axle.
each system has its own air tanks.
10. In newer vehicles with air brakes, you put on the parking brake:
placing the transmission in Park.
using a P-shaped, yellow control knob.
using a diamond-shaped, yellow, push-pull control knob.
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ME 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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