2026 Free Alaska DMV Class B Air Brakes Test 1 (25 Questions And Complete Answers)
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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.
If the safety relief valve in the air brake system releases air:
1. The compressor needs more air.
2. The air pressure has become too high.
3. The brakes are fully operational.
1. The compressor needs more air.
2. The air pressure has become too high.
3. The brakes are fully operational.
The air pressure has become too high.
Air brakes use ____ to function.
1. Compressed air
2. Liquid nitrogen
3. Carbon dioxide
1. Compressed air
2. Liquid nitrogen
3. Carbon dioxide
Compressed air
If you are braking on dry pavement while traveling at 55 mph, how much distance will brake lag add to your overall stopping distance?
1. 32 feet
2. 45 feet
3. 20 feet
1. 32 feet
2. 45 feet
3. 20 feet
32 feet
If the safety relief valve in the air brake system releases air:
1. The compressor needs more air.
2. There is something wrong with the brakes.
3. You may continue driving.
1. The compressor needs more air.
2. There is something wrong with the brakes.
3. You may continue driving.
There is something wrong with the brakes.
____ make up the emergency brake system.
1. Only parts of the parking brake system
2. Only parts of the service brake system
3. Parts of the parking and service brake systems
1. Only parts of the parking brake system
2. Only parts of the service brake system
3. Parts of the parking and service brake systems
Parts of the parking and service brake systems
Truck tractors with air brakes built on or after March 1, 1997 must have:
1. An Anti-Lock Braking System (ABS).
2. Bluetooth.
3. A GPS.
1. An Anti-Lock Braking System (ABS).
2. Bluetooth.
3. A GPS.
An Anti-Lock Braking System (ABS).
The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
1. Slack adjuster
2. One-way check valve
3. Tractor protection valve
1. Slack adjuster
2. One-way check valve
3. Tractor protection valve
One-way check valve
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.
An emergency brake must be controlled by:
1. Mechanical force.
2. Air pressure.
3. Gravity.
1. Mechanical force.
2. Air pressure.
3. Gravity.
Mechanical force.
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