2026 Idaho DMV Air Brakes Class B Test 2 (25 Questions And Complete Answers)
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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.
What does an air compressor do in an air brake system?'
1. It pumps air into the air storage tanks.
2. It fills the tires.
3. It moves air to the back of the truck.
1. It pumps air into the air storage tanks.
2. It fills the tires.
3. It moves air to the back of the truck.
It pumps air into the air storage tanks.
Alcohol evaporators are:'
1. Illegal
2. Used to add alcohol to braking systems to prevent items from freezing.
3. Only allowed on vehicles carrying hazardous materials.
1. Illegal
2. Used to add alcohol to braking systems to prevent items from freezing.
3. Only allowed on vehicles carrying hazardous materials.
Used to add alcohol to braking systems to prevent items from freezing.
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.
You should test the low pressure warning signal by:'
1. Turning on the engine and applying the trailer hand brake.
2. Rapidly pressing and releasing the brake pedal.
3. Removing wheel chocks and disengaging the parking brake.
1. Turning on the engine and applying the trailer hand brake.
2. Rapidly pressing and releasing the brake pedal.
3. Removing wheel chocks and disengaging the parking brake.
Rapidly pressing and releasing the brake pedal.
Air brakes use ____ to function.'
1. Compressed air
2. Liquid air
3. Nitrogen
1. Compressed air
2. Liquid air
3. Nitrogen
Compressed air
A low air pressure warning signal should activate:'
1. When tank pressure falls below 120 psi.
2. When tank pressure falls below 60 psi.
3. When tank pressure falls below 10 psi.
1. When tank pressure falls below 120 psi.
2. When tank pressure falls below 60 psi.
3. When tank pressure falls below 10 psi.
When tank pressure falls below 60 psi.
A safety valve is set to open at ____ pounds per square inch (psi).'
1. 100
2. 150
3. 200
1. 100
2. 150
3. 200
150
The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.'
1. 8 psi
2. 5 psi
3. 3 psi
1. 8 psi
2. 5 psi
3. 3 psi
5 psi
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)
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