2026 District Of Columbia DMV Air Brakes Class B Test 1 (25 Questions And Complete Answers)
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If a vehicle has air brakes, the air compressor drive belt should be checked before each drive. In what condition should the belt be?
1. Loose
2. Tight
3. Cracked
4. Bumpy
1. Loose
2. Tight
3. Cracked
4. Bumpy
Tight
Friction inside a brake drum is caused when the brake shoes and linings:
1. Push against each other.
2. Separate from the axle.
3. Push against the inside of the drum.
4. Create excess heat.
1. Push against each other.
2. Separate from the axle.
3. Push against the inside of the drum.
4. Create excess heat.
Push against the inside of the drum.
When the spring brakes are activated in a vehicle with air brakes, you should never:
1. Turn on the lights.
2. Turn the vehicle off.
3. Push the brake pedal down.
4. Open the trailer doors.
1. Turn on the lights.
2. Turn the vehicle off.
3. Push the brake pedal down.
4. Open the trailer doors.
Push the brake pedal down.
What is brake lag?
1. The time required for the brakes to work after the brake pedal is pushed
2. The distance between the brake pedal’s resting position and the floor
3. The amount of air pressure used to stop a vehicle
4. How faded the brakes are
1. The time required for the brakes to work after the brake pedal is pushed
2. The distance between the brake pedal’s resting position and the floor
3. The amount of air pressure used to stop a vehicle
4. How faded the brakes are
The time required for the brakes to work after the brake pedal is pushed
While driving, spring brakes are generally held in place by:
1. Air pressure.
2. Chocks.
3. Foundation brakes.
4. Sturdy ties.
1. Air pressure.
2. Chocks.
3. Foundation brakes.
4. Sturdy ties.
Air pressure.
The air storage tanks:
1. Hold only enough air for one braking cycle.
2. Hold enough air for brakes to be used several times if the compressor stops working.
3. Do not hold air unless there is an emergency.
4. Hold enough air for more than 1,000 braking cycles.
1. Hold only enough air for one braking cycle.
2. Hold enough air for brakes to be used several times if the compressor stops working.
3. Do not hold air unless there is an emergency.
4. Hold enough air for more than 1,000 braking cycles.
Hold enough air for brakes to be used several times if the compressor stops working.
Emergency brakes:
1. Are optional.
2. Are required on tractors.
3. Are only required on trailers.
4. Are not required on trucks.
1. Are optional.
2. Are required on tractors.
3. Are only required on trailers.
4. Are not required on trucks.
Are required on tractors.
An air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of:
1. 125 psi.
2. 150 psi.
3. 100 psi.
4. 80 psi.
1. 125 psi.
2. 150 psi.
3. 100 psi.
4. 80 psi.
125 psi.
Air tanks usually hold enough compressed air:
1. For one stop before needing to be refilled.
2. For several stops before needing to be refilled.
3. For a day’s worth of braking.
4. For an unlimited number of stops.
1. For one stop before needing to be refilled.
2. For several stops before needing to be refilled.
3. For a day’s worth of braking.
4. For an unlimited number of stops.
For several stops before needing to be refilled.
To confirm that a trailer has ABS, you can:
1. Look under the trailer for wheel speed sensors coming from the back of the brakes.
2. Look under the hood for the ABS sticker.
3. Look at the tires.
4. Remove a tire and look for the ABS sensor on the axle.
1. Look under the trailer for wheel speed sensors coming from the back of the brakes.
2. Look under the hood for the ABS sticker.
3. Look at the tires.
4. Remove a tire and look for the ABS sensor on the axle.
Look under the trailer for wheel speed sensors coming from the back of the brakes.
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