2026 Free Alabama DMV CDL Air Blakes Class B Test 1 (25 Questions And Complete Answers)
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When only the tractor is equipped with an Anti-Lock Braking System (ABS)
1. There is a decreased risk of jackknifing.
2. There is an increased risk of jackknifing.
3. The brakes will not work as effectively as they would without ABS.
4. The brakes will become more sensitive.
1. There is a decreased risk of jackknifing.
2. There is an increased risk of jackknifing.
3. The brakes will not work as effectively as they would without ABS.
4. The brakes will become more sensitive.
There is a decreased risk of jackknifing.
In cold weather, an alcohol evaporator should be checked and filled:
1. Once a week.
2. Every day.
3. Every hour.
4. Once a month.
1. Once a week.
2. Every day.
3. Every hour.
4. Once a month.
Every day.
The service brake system:
1. Applies and releases the brakes when you press the brake pedal while driving normally.
2. Applies and releases the parking brakes.
3. Applies and releases the emergency brake.
4. Applies and releases the axle brake.
1. Applies and releases the brakes when you press the brake pedal while driving normally.
2. Applies and releases the parking brakes.
3. Applies and releases the emergency brake.
4. Applies and releases the axle brake.
Applies and releases the brakes when you press the brake pedal while driving normally.
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.
Friction inside a brake drum is caused when the brake shoes and linings:
1. Push against each other.
2. Separate from the axle.
3. Create excess heat.
4. Push against the inside of the drum.
1. Push against each other.
2. Separate from the axle.
3. Create excess heat.
4. Push against the inside of the drum.
Push against the inside of the drum.
If the spring brakes are activated, you should never:
1. Push down the brake pedal.
2. Open the hood.
3. Release air from the air storage tanks.
4. Open the door to the cab.
1. Push down the brake pedal.
2. Open the hood.
3. Release air from the air storage tanks.
4. Open the door to the cab.
Push down the brake pedal.
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.
A slack adjuster should move no more than ____ from where it is attached to the push rod.
1. Two inches
2. Five inches
3. One inch
1. Two inches
2. Five inches
3. One inch
One inch
The air storage tanks:
1. Hold only enough air for one braking cycle.
2. Hold enough air for the brakes to be used several times if the compressor stops working.
3. Do not hold air unless there is an emergency.
1. Hold only enough air for one braking cycle.
2. Hold enough air for the brakes to be used several times if the compressor stops working.
3. Do not hold air unless there is an emergency.
Hold enough air for the brakes to be used several times if the compressor stops working.
When leaving your vehicle unattended:
1. The parking brake should be used.
2. The parking brake only needs to be used if the vehicle is parked on a slope.
3. The parking brake should not be used, as it can damage the tires.
1. The parking brake should be used.
2. The parking brake only needs to be used if the vehicle is parked on a slope.
3. The parking brake should not be used, as it can damage the tires.
The parking brake should be used.
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