Air Brakes CDL Test - FREE Virginia CDL Practice Test

1. Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:

drive slower to keep your vehicle in a straight line.
monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.

2. You should always try to back toward the driver's side because:

backing toward the left side is more dangerous.
you can watch the rear of your vehicle out the side window.
None of the above.

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.

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

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

5. Antifreeze:

helps the engine only under hot conditions.
helps the engine only when the temperature is below freezing.
helps the engine under hot conditions as well as cold conditions.

6. If your truck catches fire, the first thing you should do is to:

pull into a service station and call for help.
get the vehicle off the road and park near other vehicles.
pull off the road and park in an open area.

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

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

8. Front wheel braking is good:

9. When you apply the brakes, the brake shoes and linings are pushed against:

10. Supply pressure gauges tell drivers:

how much air pressure they are applying to the brakes.
how much pressure is in the air tanks.
All of the above.

VA CDL AIR BRAKES PRACTICE TEST