2026 Free Alabama DMV CDL Air Blakes Class B Test 2 (25 Questions And Complete Answers)
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What kind of brakes do most newer heavy-duty trucks use?
1. Single air brakes
2. Dual air brakes
3. Triple air brakes
1. Single air brakes
2. Dual air brakes
3. Triple air brakes
Dual air brakes
The application pressure gauge:
1. Shows how much air pressure is being applied to the brakes.
2. Shows the temperature of air being used in the braking system.
3. Shows the pressure of the air coming from the compressor.
4. Shows the number of times the brakes have been used.
1. Shows how much air pressure is being applied to the brakes.
2. Shows the temperature of air being used in the braking system.
3. Shows the pressure of the air coming from the compressor.
4. Shows the number of times the brakes have been used.
Shows how much air pressure is being applied to the brakes.
Which of the following is not part of a vehicle’s air brake system?
1. Air gauges
2. Low pressure warning device
3. Air filter
1. Air gauges
2. Low pressure warning device
3. Air filter
Air filter
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.
An application pressure gauge shows:
1. How much air pressure is being applied to the brakes.
2. How much air pressure is available.
3. How much air pressure is required to stop a vehicle.
1. How much air pressure is being applied to the brakes.
2. How much air pressure is available.
3. How much air pressure is required to stop a vehicle.
How much air pressure is being applied to the brakes.
Failing to drain air tanks could result in:
1. Water accumulations freezing and causing brake failure.
2. Squishy brakes.
3. Too much air collecting in the tanks.
1. Water accumulations freezing and causing brake failure.
2. Squishy brakes.
3. Too much air collecting in the tanks.
Water accumulations freezing and causing brake failure.
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
When parked on a flat surface, you should:
1. Use wheel chocks to prevent your vehicle from moving.
2. Not use wheel chocks.
3. Use wheel chocks, but only if you have applied the parking brake.
1. Use wheel chocks to prevent your vehicle from moving.
2. Not use wheel chocks.
3. Use wheel chocks, but only if you have applied the parking brake.
Use wheel chocks to prevent your vehicle from moving.
In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:
1. You will be unable to move the vehicle.
2. A separate air tank can be used to release the spring brakes for a short period of time.
3. You can use the spring brakes to continue driving normally.
4. The air tanks will automatically refill to a safe air pressure level.
1. You will be unable to move the vehicle.
2. A separate air tank can be used to release the spring brakes for a short period of time.
3. You can use the spring brakes to continue driving normally.
4. The air tanks will automatically refill to a safe air pressure level.
A separate air tank can be used to release the spring brakes for a short period of time.
Having ABS on only one axle:
1. Can be dangerous.
2. Still allows you additional control when braking.
3. Slows the vehicle, but cannot stop it.
1. Can be dangerous.
2. Still allows you additional control when braking.
3. Slows the vehicle, but cannot stop it.
Still allows you additional control when braking.
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