2026 Maine DMV Class A Air Brakes Test 2 (25 Questions And Complete Answers)
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Terms in this set
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How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?
1. 300 feet
2. 100 feet
3. 450 feet
1. 300 feet
2. 100 feet
3. 450 feet
450 feet
Friction in an S-cam brake is caused when the brake shoes and linings:
1. Press against the outside of the brake drum.
2. Press against the inside of the brake drum.
3. Push against each other.
1. Press against the outside of the brake drum.
2. Press against the inside of the brake drum.
3. Push against each other.
Press against the inside of the brake drum.
Using the brakes creates heat. If too much heat is produced:
1. The brakes may not work.
2. The brakes may squeak more than usual.
3. The brakes will brake unevenly.
1. The brakes may not work.
2. The brakes may squeak more than usual.
3. The brakes will brake unevenly.
The brakes may not work.
If the spring brakes are on, you should:
1. Not use the brake pedal.
2. Press the accelerator.
3. Move the steering wheel.
1. Not use the brake pedal.
2. Press the accelerator.
3. Move the steering wheel.
Not use the brake pedal.
What helps prevent wheel lockup when braking?
1. An Anti-Lock Braking System (ABS)
2. Air brakes
3. An alternator
1. An Anti-Lock Braking System (ABS)
2. Air brakes
3. An alternator
An Anti-Lock Braking System (ABS)
Why should you regularly drain the air tanks?
1. Because the air gets old and needs to be replaced
2. Because compressed air contains some water and the water collects in the tanks
3. To allow for a change in pressure
1. Because the air gets old and needs to be replaced
2. Because compressed air contains some water and the water collects in the tanks
3. To allow for a change in pressure
Because compressed air contains some water and the water collects in the tanks
When stopping in an emergency situation, you should:
1. Veer your trailer to the right and stop.
2. Stop in a straight line.
3. Veer your trailer to the left and stop.
1. Veer your trailer to the right and stop.
2. Stop in a straight line.
3. Veer your trailer to the left and stop.
Stop in a straight line.
Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
1. One half
2. One third
3. One fifth
1. One half
2. One third
3. One fifth
One half
What should happen before the air pressure in an air brake system tank falls below 55 psi?
1. The warning light should activate.
2. The vehicle will be unable to shift out of gear.
3. The front lights should flash.
1. The warning light should activate.
2. The vehicle will be unable to shift out of gear.
3. The front lights should flash.
The warning light should activate.
What is brake lag?
1. The time required for the brakes to work after the brake pedal is pressed
2. The distance between the brake pedal and the floor
3. The amount of air pressure used to stop the vehicle
1. The time required for the brakes to work after the brake pedal is pressed
2. The distance between the brake pedal and the floor
3. The amount of air pressure used to stop the vehicle
The time required for the brakes to work after the brake pedal is pressed
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