2026 Iowa DMV Air Brakes Class A Test 1 (25 Questions And Complete Answers)
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Why do large vehicles use air brakes?
1. Other brake systems squeak too loudly.
2. Air brakes are very effective systems.
3. Other braking systems are hard to come by.
1. Other brake systems squeak too loudly.
2. Air brakes are very effective systems.
3. Other braking systems are hard to come by.
Air brakes are very effective systems.
If using spring brakes when hauling a heavy load, a complete stop will:
1. Be impossible.
2. Take a long time.
3. Take a short amount of time.
1. Be impossible.
2. Take a long time.
3. Take a short amount of time.
Take a long time.
Brake fade is a result of:
1. Brakes being exposed to sunlight.
2. Brakes being exposed to moisture.
3. Excessive use of the brakes.
1. Brakes being exposed to sunlight.
2. Brakes being exposed to moisture.
3. Excessive use of the brakes.
Excessive use of the brakes.
If the spring brakes are on, you should:
1. Not use the brake pedal.
2. Press the accelerator.
3. Move the steering wheel.
1. Not use the brake pedal.
2. Press the accelerator.
3. Move the steering wheel.
Not use the brake pedal.
When leaving a vehicle unattended, a driver should:'
1. Always set the parking brake.
2. Only set the parking brake if the vehicle is parked on a slope.
3. Deflate the tires by 10 percent.
1. Always set the parking brake.
2. Only set the parking brake if the vehicle is parked on a slope.
3. Deflate the tires by 10 percent.
Always set the parking brake.
In a vehicle with dual parking control valves, a separate air tank can be used:
1. To make the air brakes work more effectively.
2. To temporarily release the spring brakes.
3. To charge the brakes on the rear trailer.
1. To make the air brakes work more effectively.
2. To temporarily release the spring brakes.
3. To charge the brakes on the rear trailer.
To temporarily release the spring brakes.
What does the air compressor governor do?
1. It stops the compressor from pumping air.
2. It turns on the air compressor.
3. It stores the compressed air.
1. It stops the compressor from pumping air.
2. It turns on the air compressor.
3. It stores the compressed air.
It stops the compressor from pumping air.
Anti-Lock Braking Systems (ABS):
1. Reduce a vehicle's normal braking capacity.
2. Are in addition to other braking systems and do not reduce a vehicle's braking power.
3. Are not effective on larger vehicles.
1. Reduce a vehicle's normal braking capacity.
2. Are in addition to other braking systems and do not reduce a vehicle's braking power.
3. Are not effective on larger vehicles.
Are in addition to other braking systems and do not reduce a vehicle's braking power.
A ____ allows a driver to gradually apply spring brakes.
1. Modulating control valve
2. Trailer air supply control
3. Relay valve
1. Modulating control valve
2. Trailer air supply control
3. Relay valve
Modulating control valve
If the low air pressure warning signal comes on, you should:
1. Continue driving, but have the brakes repaired within a week.
2. Pull over and inspect the brakes.
3. Phone a mechanic while driving.
1. Continue driving, but have the brakes repaired within a week.
2. Pull over and inspect the brakes.
3. Phone a mechanic while driving.
Pull over and inspect the brakes.
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