AIR BRAKES CDL PRACTICE TEST - DISTRICT OF COLUMBIA
View instructions
The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the District of Columbia CDL knowledge test. The DC CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the District of Columbia CDL Manual. Take this DC CDL practice test now to prepare for the actual air brakes test!
1.
When the low air pressure warning light and buzzer first come on, you should:
|
downshift and slow down.
|
|
|
bring the vehicle to a safe stop right away.
|
|
|
speed up to restore pressure.
|
|
|
immediately put alcohol into the air system.
|
2.
To perform an applied leakage test, the vehicle’s air pressure should be built up to maximum pressure. Check the air gauge to see that the air pressure should drop no more than:
|
2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
|
|
|
1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
|
|
|
5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
|
|
|
3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
|
3.
Air tanks must be drained because:
|
if one air system is low on pressure, the rear brakes will not be operating fully.
|
|
|
compressed air usually has some water in it. The water can freeze in cold
weather and cause brake failure.
|
|
|
when you push the brake pedal, air is let into each brake chamber.
|
|
|
if you don't drain the tanks yourself, your battery fluid may drain out.
|
4.
If your vehicle is hydroplaning, you should:
|
accelerate to get through the water as quickly as possible.
|
|
|
use the brakes to slow down.
|
|
|
release the accelerator and push in the clutch.
|
|
|
None of the above.
|
5.
Which of the following is NOT a warning sign of fatigue?
|
Trouble remembering the last few miles driven
|
|
|
Frequent blinking
|
|
|
Driving at the speed of the traffic
|
|
|
Heavy eyelids
|
Next page
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More