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

1. As part of the final air brake check, you should:

Check air compressor governor cut-in and cut-out pressure.
Test low pressure warning signal.
Test air leakage rate.
All of the above.

2. When driving at night, you should:

put your own high beams on if other drivers don't put their low beams on.
drive slowly enough to see obstacles with your headlights.
look directly at the lights of oncoming vehicles.
use dark lenses if possible.

3. When the wheels of a trailer lock up:

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

4. If your trailer starts to skid, you should:

accelerate slightly.
use the trailer hand brake (if you have one) to straighten out the rig.
keep the rear of your vehicle close to the curb.
release the brakes to get traction back.

5. When driving on slippery roads, you should NOT:

use the engine brake.
try to anticipate stops early.
go slowly.
watch far enough ahead to keep a steady speed.

6. If you get stuck on railroad tracks, you should:

have a helper push your vehicle.
stay in the vehicle and call for help.
get out of the vehicle and away from the tracks.
check the engine compartment quickly.

7. How can you tell if your vehicle is equipped with ABS?

Trailers will have yellow ABS malfunction lamps on the left side.
Look for yellow ABS malfunction lamps on the instrument panel.
Look under the vehicle for the wheel speed sensor wires coming from the back of the brakes.
All of the above.

8. The s-cam:

forces the brake shoes away from one another and presses them against the inside of the brake drum.
pulls the brake shoes away from the drum.
helps ensure that air flows to all trailers.
All of the above.

9. After starting the engine, oil pressure should rise to a normal level:

10. What is an important thing to remember about emergency braking?

Your natural response (hitting the brakes) is never the right solution.
The more heavily loaded semitrailer trailer should be in the rear.
Pushing down on the brake pedal as hard as you can will only keep the wheels locked up and cause a skid.
You should never use stab braking.

LOUISIANA CDL AIR BRAKES PRACTICE TEST