2026 District Of Columbia DMV Air Brakes Class A Test 2 (25 Questions And Complete Answers)
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Most heavy-duty vehicles use:
1. Single air brake systems.
2. Dual air brake systems.
3. Triple air brake systems.
4. Quadruple air brake systems.
1. Single air brake systems.
2. Dual air brake systems.
3. Triple air brake systems.
4. Quadruple air brake systems.
Dual air brake systems.
Failing to drain the tanks in an air brake system can result in:
1. Water freezing and causing brake failure.
2. Squishy brakes.
3. Too much air collecting.
4. Too much fuel being carried.
1. Water freezing and causing brake failure.
2. Squishy brakes.
3. Too much air collecting.
4. Too much fuel being carried.
Water freezing and causing brake failure.
To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
1. Set the control to normal.
2. Set the control to the off position.
3. Set the control to neutral.
4. Keep the control at the halfway mark.
1. Set the control to normal.
2. Set the control to the off position.
3. Set the control to neutral.
4. Keep the control at the halfway mark.
Set the control to normal.
While driving downhill, you should brake until you reach a speed that is ____ below your safe speed, then release the brake pedal.
1. 5 mph
2. 10 mph
3. 15 mph
4. 20 mph
1. 5 mph
2. 10 mph
3. 15 mph
4. 20 mph
5 mph
What kind of force must emergency brakes use?
1. Air pressure
2. Mechanical
3. Heavy
4. Electrical
1. Air pressure
2. Mechanical
3. Heavy
4. Electrical
Mechanical
During an applied leakage test, the maximum leakage rate for a triple 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.
6 psi in a minute.
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.
How is water and compressor oil removed from the bottom of an air storage tank?
1. The water and oil are siphoned out of the tank.
2. A drain valve is opened to remove the water and oil from the tank.
3. The water and oil are removed automatically as the brakes are used.
4. A sponge is used to soak up the water and oil.
1. The water and oil are siphoned out of the tank.
2. A drain valve is opened to remove the water and oil from the tank.
3. The water and oil are removed automatically as the brakes are used.
4. A sponge is used to soak up the water and oil.
A drain valve is opened to remove the water and oil from the tank.
If using air tanks with manually operated drains, how often should you drain the tanks?
1. Every day
2. Once a week
3. Once a month
4. Once every six months
1. Every day
2. Once a week
3. Once a month
4. Once every six months
Every day
When the brake pedal is depressed, air brakes work:
1. Immediately.
2. After about a minute.
3. After a short delay.
4. Only if the green lever on the control panel is pushed down.
1. Immediately.
2. After about a minute.
3. After a short delay.
4. Only if the green lever on the control panel is pushed down.
After a short delay.
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