2026 Illinois DMV Air Brakes Class B Test 2 (25 Questions And Complete Answers)
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A dual air brake system:
1. Has a single air brake system, but uses two sets of controls.
2. Has one air brake system for each side of the truck.
3. Has two brakes for each wheel.
4. Has two separate air brake systems, but uses a single set of controls.
1. Has a single air brake system, but uses two sets of controls.
2. Has one air brake system for each side of the truck.
3. Has two brakes for each wheel.
4. Has two separate air brake systems, but uses a single set of controls.
Has two separate air brake systems, but uses a single set of controls.
On a truck with air brakes, the braking system’s air compressor:
1. Pumps air into the air storage tanks.
2. Fills the tires.
3. Moves air to the back of the truck.
4. Cleans the brakes.
1. Pumps air into the air storage tanks.
2. Fills the tires.
3. Moves air to the back of the truck.
4. Cleans the brakes.
Pumps air into the air storage tanks.
Air tank drains:
1. Allow rain water to enter the tanks.
2. Are used to drain water and oil from the tanks.
3. Should never be opened.
4. Must remain open while driving.
1. Allow rain water to enter the tanks.
2. Are used to drain water and oil from the tanks.
3. Should never be opened.
4. Must remain open while driving.
Are used to drain water and oil from the tanks.
When inspecting your brakes, a slack adjuster should move ____ from where it is attached to the push rod.
1. At least three inches
2. More than two inches
3. Up to five inches
4. No more than one inch
1. At least three inches
2. More than two inches
3. Up to five inches
4. No more than one inch
No more than one inch
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.
During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.
1. 1 psi
2. 2 psi
3. 3 psi
4. 4 psi
1. 1 psi
2. 2 psi
3. 3 psi
4. 4 psi
2 psi
In a dual air brake system, a leak in one system:
1. Always means there are leaks in both systems.
2. May not affect the other system.
3. Is not something to worry about.
4. Will also affect the other system.
1. Always means there are leaks in both systems.
2. May not affect the other system.
3. Is not something to worry about.
4. Will also affect the other system.
May not affect the other system.
Test the low pressure warning signal:
1. Once a month.
2. Once a week.
3. Twice a week.
4. Before every trip.
1. Once a month.
2. Once a week.
3. Twice a week.
4. Before every trip.
Before every trip.
When about to drive a vehicle with a dual brake system, a driver should:
1. Let the vehicle warm up to ensure the fuel reaches the engine.
2. Wait for air pressure to build in both the primary and secondary systems.
3. Begin driving just after the engine starts.
4. Pump the pedal about 20 times to build pressure, then begin driving.
1. Let the vehicle warm up to ensure the fuel reaches the engine.
2. Wait for air pressure to build in both the primary and secondary systems.
3. Begin driving just after the engine starts.
4. Pump the pedal about 20 times to build pressure, then begin driving.
Wait for air pressure to build in both the primary and secondary systems.
In a dual air brake system:
1. Each system has separate air tanks, hoses, and lines.
2. The systems share air tanks, but each has its own separate hoses and lines.
3. Each system uses the same lines and hoses.
4. One system is the main braking system and a second system is ready to be used if the first one fails.
1. Each system has separate air tanks, hoses, and lines.
2. The systems share air tanks, but each has its own separate hoses and lines.
3. Each system uses the same lines and hoses.
4. One system is the main braking system and a second system is ready to be used if the first one fails.
Each system has separate air tanks, hoses, and lines.
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