2026 Iowa DMV Air Brakes Class A Test 2 (25 Questions And Complete Answers)
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If you are driving and the ABS light comes on, it means that the ABS:
1. Cannot work due to weather conditions.
2. Has just been activated.
3. Is not working properly.
1. Cannot work due to weather conditions.
2. Has just been activated.
3. Is not working properly.
Is not working properly.
If the low air pressure warning signal comes on in a vehicle with air brakes, the driver should:
1. Test the brakes while driving, but continue driving if nothing seems wrong.
2. Immediately stop driving.
3. Drive with the hazard lights activated.
1. Test the brakes while driving, but continue driving if nothing seems wrong.
2. Immediately stop driving.
3. Drive with the hazard lights activated.
Immediately stop driving.
In a dual air brake system:
1. Air tanks are shared between both systems.
2. Each system has its own air tanks.
3. You must designate which system you are using.
1. Air tanks are shared between both systems.
2. Each system has its own air tanks.
3. You must designate which system you are using.
Each system has its own air tanks.
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
To make a stop in a vehicle equipped with air brakes, the driver should:'
1. Press the brake pedal down.
2. Lift the brake pedal up.
3. Pull out the air brake knob.
1. Press the brake pedal down.
2. Lift the brake pedal up.
3. Pull out the air brake knob.
Press the brake pedal down.
Brakes out of adjustment will:
1. Work properly.
2. Cause some of the brakes to overwork and malfunction.
3. Allow better acceleration.
1. Work properly.
2. Cause some of the brakes to overwork and malfunction.
3. Allow better acceleration.
Cause some of the brakes to overwork and malfunction.
The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:
1. Presses the brake pedal.
2. Uses the emergency brake.
3. Uses the trailer hand valve.
1. Presses the brake pedal.
2. Uses the emergency brake.
3. Uses the trailer hand valve.
Presses the brake pedal.
What do air brakes use to make the brakes work?
1. Compressed air
2. Outside air
3. Non-compressed air
1. Compressed air
2. Outside air
3. Non-compressed air
Compressed air
If the safety relief valve in an air brake system is releasing air:
1. You should not be concerned as this is a normal process.
2. There is something wrong with the brakes.
3. The valve is operational.
1. You should not be concerned as this is a normal process.
2. There is something wrong with the brakes.
3. The valve is operational.
There is something wrong with the brakes.
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.
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