2026 Idaho DMV Air Brakes Class B Test 1 (25 Questions And Complete Answers)
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The ____ are activated by an electric switch that is triggered by the brake pedal.
1. Headlights
2. Turn signals
3. Brake lights
1. Headlights
2. Turn signals
3. Brake lights
Brake lights
Why do large vehicles use air brakes?
1. Other brake systems squeak too loudly.
2. Air brakes are very effective systems.
3. Other braking systems are hard to come by.
1. Other brake systems squeak too loudly.
2. Air brakes are very effective systems.
3. Other braking systems are hard to come by.
Air brakes are very effective systems.
When traveling down a steep downgrade:
1. The air brakes should be used.
2. The vehicle should be placed in a low gear and the driver should use engine braking.
3. The driver should continually downshift instead of using the brakes.
1. The air brakes should be used.
2. The vehicle should be placed in a low gear and the driver should use engine braking.
3. The driver should continually downshift instead of using the brakes.
The vehicle should be placed in a low gear and the driver should use engine braking.
Air tank drains should:
1. Not be used by the driver.
2. Only be used when it is wet outside.
3. Be used to drain the tanks completely.
1. Not be used by the driver.
2. Only be used when it is wet outside.
3. Be used to drain the tanks completely.
Be used to drain the tanks completely.
Emergency brakes:
1. Are not required on vehicles with air brakes.
2. Are required only on buses.
3. Are required on all vehicles.
1. Are not required on vehicles with air brakes.
2. Are required only on buses.
3. Are required on all vehicles.
Are required on all vehicles.
You should ____ if the low pressure warning signal activates while you are driving.
1. Stop where you are and park
2. Exit the roadway as soon as safely possible
3. Continue driving normally
1. Stop where you are and park
2. Exit the roadway as soon as safely possible
3. Continue driving normally
Exit the roadway as soon as safely possible
Which of the following is not part of a vehicle’s air brake system?
1. Air gauges
2. Low pressure warning device
3. Air filter
1. Air gauges
2. Low pressure warning device
3. Air filter
Air filter
Braking mechanisms are located inside:
1. The fifth wheel.
2. A brake drum.
3. The landing gear.
1. The fifth wheel.
2. A brake drum.
3. The landing gear.
A brake drum.
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.
Air storage tanks:
1. Are not allowed on a vehicle.
2. Hold compressed air for the brakes.
3. Should be drained of excess air after every trip.
1. Are not allowed on a vehicle.
2. Hold compressed air for the brakes.
3. Should be drained of excess air after every trip.
Hold compressed air for the brakes.
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