Air Brakes CDL Test - FREE Alabama CDL Practice Test

1. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:

2. A low air pressure warning signal is required on:

all vehicles with air brakes built after 2009.
all vehicles with air brakes built after 2005.
Warning signals are optional.
all vehicles with air brakes.

3. Which of the following is not part of the air brake system?

4. To apply the parking brakes:

pull the parking brake control knob out.
place the parking brake control knob in Neutral.
push the parking brake control knob in.
push the brake pedal three times.

5. In a dual air brake system, if one air system is very low on pressure:

either the front or rear brakes will not be operating fully.
you should pump the brakes to restore pressure.
the effect won't be noticeable for the first 50 miles.
you should drive and brake as you always have.

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.
the value specified by the manufacturer as the loaded weight of one axle.

7. If your ABS fails:

the first step is to get the vehicle off the road and stop.
you will have no brake function, and could lose control.
you will still have normal brake functions.
your tires might grab unexpectedly and you could lose control.

8. Which of the following can cause brakes to fade or fail?

Excessive use of the service brakes
Not relying on the engine braking effect
Brakes out of adjustment
All of the above.

9. Dual tires:

should always come in contact with each other.
should not come in contact with each other.
should come in contact with each other whenever possible.
are dangerous.

10. If you are feeling sleepy, you should:

AL CDL AIR BRAKES PRACTICE TEST