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

1. To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?

If you don't pass the air brakes test, you can't get a CDL.
If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
If you don't, you will only receive a CDL permit.
All trucks have air brakes.

2. The spring brakes come on:

when air pressure in both air brake systems rises to a value set by the manufacturer.
when you lose ABS control.
when you bring the vehicle to a complete stop right away.
when main air pressure is lost.

3. Banked curves:

are reserved for pedestrians.
should always be avoided.
can be taken at any speed.
have a safe "design speed".

4. If your vehicle is hydroplaning, you should:

release the accelerator and push in the clutch.
use the brakes to slow down.
accelerate to get through the water as quickly as possible.
None of the above.

5. If you perform the skills test in a vehicle that is not equipped with air brakes:

you will be required to operate a CMV without hydraulic brakes.
you will be required to take the tank vehicle test.
you will be required to operate vehicles with air brakes.
you will be restricted from operating vehicles with air brakes.

6. The tractor protection valve:

will close automatically if the air pressure drops to a certain level.
will close if you apply the parking brakes.
provides the air supply for the brake system.
All of the above.

7. Your vehicle has a dual air brake system. If one air system is very low on pressure, you should:

reduce your speed and drive to the nearest garage for repairs.
bring the vehicle to a safe stop, and have the air brakes system fixed.
call your dispatcher or supervisor for instructions.
reduce your speed and check the low air pressure warning signal for the other system regularly.

8. With the controlled braking method, you:

apply the brakes all the way and release brakes when the wheels the lock up.
push down on the brake pedal as hard as you can so that the wheels the lock up.
apply the brakes as hard as you can without locking the wheels.
None of the above.

9. Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.

for one stop
for 3 days
for one day
several times

10. Before driving a vehicle with a dual air system, the air compressor should build up a minimum of _____ pressure in both the primary and secondary systems.

50 psi
75 psi
100 psi
10 psi

Number of questions:	25
Correct answers to pass:	20
Passing score:	80%

AIR BRAKES PRACTICE TEST - ALABAMA

AL Air Brakes CDL Test