2026 Illinois DMV Air Brakes Class B Test 1 (25 Questions And Complete Answers)
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When about to drive a vehicle with a dual brake system, a driver should:
1. Let the vehicle warm up to ensure the fuel reaches the engine.
2. Wait for air pressure to build in both the primary and secondary systems.
3. Begin driving just after the engine starts.
4. Pump the pedal about 20 times to build pressure, then begin driving.
1. Let the vehicle warm up to ensure the fuel reaches the engine.
2. Wait for air pressure to build in both the primary and secondary systems.
3. Begin driving just after the engine starts.
4. Pump the pedal about 20 times to build pressure, then begin driving.
Wait for air pressure to build in both the primary and secondary systems.
Using an Anti-Lock Braking System (ABS):
1. Shortens stopping distance.
2. Shortens brake response time.
3. Provides less control.
4. Provides more control.
1. Shortens stopping distance.
2. Shortens brake response time.
3. Provides less control.
4. Provides more control.
Provides more control.
If the low pressure warning light comes on while you are driving:
1. Braking will only occur if there is enough air in the tanks.
2. You can brake 14 times before the air in the system runs out.
3. You should continue to drive normally and check the brake system when it is convenient.
4. You should continue driving, but turn the emergency flashers on to warn other motorists.
1. Braking will only occur if there is enough air in the tanks.
2. You can brake 14 times before the air in the system runs out.
3. You should continue to drive normally and check the brake system when it is convenient.
4. You should continue driving, but turn the emergency flashers on to warn other motorists.
Braking will only occur if there is enough air in the tanks.
All air tanks must include:
1. A drain valve.
2. A lock.
3. A trap door.
4. A warning sticker.
1. A drain valve.
2. A lock.
3. A trap door.
4. A warning sticker.
A drain valve.
Air tank drains:
1. Allow rain water to enter the tanks.
2. Are used to drain water and oil from the tanks.
3. Should never be opened.
4. Must remain open while driving.
1. Allow rain water to enter the tanks.
2. Are used to drain water and oil from the tanks.
3. Should never be opened.
4. Must remain open while driving.
Are used to drain water and oil from the tanks.
How should you test the low pressure warning signal?
1. Engage and disable the parking brake.
2. Rapidly press and release the brake pedal.
3. Open the rear shut-off valves.
4. Uncouple and recouple all glad hands.
1. Engage and disable the parking brake.
2. Rapidly press and release the brake pedal.
3. Open the rear shut-off valves.
4. Uncouple and recouple all glad hands.
Rapidly press and release the brake pedal.
Air pressure should build up in a single air system within:
1. 15 minutes.
2. 12 minutes.
3. Three minutes.
4. One minute.
1. 15 minutes.
2. 12 minutes.
3. Three minutes.
4. One minute.
Three minutes.
During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
1. 10 psi in a minute.
2. 8 psi in a minute.
3. 6 psi in a minute.
4. 4 psi in a minute.
1. 10 psi in a minute.
2. 8 psi in a minute.
3. 6 psi in a minute.
4. 4 psi in a minute.
4 psi in a minute.
Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:
1. Are necessary for the proper function of the air brake system.
2. Should be added if low.
3. Should be removed regularly.
4. Are not concerns.
1. Are necessary for the proper function of the air brake system.
2. Should be added if low.
3. Should be removed regularly.
4. Are not concerns.
Should be removed regularly.
The parking brake should be:
1. Used whenever you park the vehicle.
2. Used while driving.
3. Set when driving in bad weather.
4. Used to stop the vehicle in normal driving.
1. Used whenever you park the vehicle.
2. Used while driving.
3. Set when driving in bad weather.
4. Used to stop the vehicle in normal driving.
Used whenever you park the vehicle.
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