Air Brakes Test Maine (2024) - FREE CDL Practice Test

1. Front brake limiting valves were used to:

reduce your speed so further braking or shifting is not required.
prevent overheating of the front tires.
reduce the chance of the front wheels skidding on slippery surfaces.

2. You should NOT use the parking brakes if:

3. A driver distraction is anything that takes your attention away from driving, such as:

4. The air storage tanks:

are used to hold compressed air.
stop the compressor from pumping air.
are connected to the engine through gears or a v-belt.

5. Some air brake systems have an alcohol evaporator to:

prevent ice from forming in the brake system.
reduce the danger of slipping.
reduce the stopping power of the vehicle.

6. Axle weight is:

the weight transmitted to the ground by one axle or one set of axles.
the maximum safe weight your tires can carry at a specified pressure.
the weight of all the axles added together.

7. To check the slack adjusters:

check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
park downhill and see if the vehicle rolls.

8. The parking brake:

should be used when driving in bad weather.
should be used when you need to apply the brakes firmly.
should be used whenever you park.

9. Which of the following is NOT a warning sign of fatigue?

Heavy eyelids
Frequent blinking
Driving at the speed of the traffic

10. When the wheels of a trailer lock up:

the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
ABS will increase stopping power.

AIR BRAKES CDL PRACTICE TEST - MAINE