Save Time and Get a Pass Guarantee! LIMITED-TIME OFFER: Get CDL PREMIUM Now and SAVE $64! Upgrade To Premium


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 Vermont CDL knowledge test. The VT 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 Vermont CDL Manual. Take this VT CDL practice test now to prepare for the actual air brakes test!
1. The air brake lag distance at 55 mph on dry pavement adds about:
60 feet.
32 feet.
75 feet.
2. Spring brakes are usually held back by:
modulating control valves.
air pressure.
the antilock braking system.
3. Which of the following is not a way to know when to change gears?
Use road speed (mph)
Check that the pressure gauge shows normal oil pressure
Use engine speed (rpm)
4. To apply the parking brakes:
pull the parking brake control knob out.
push the parking brake control knob in.
place the parking brake control knob in Neutral.
5. When the air pressure is built up to governor cutoff, the air leakage rate for combination vehicles with the engine off and the foot brake fully applied should be less than_____ in one minute.
2 psi
3 psi
4 psi
6. With brake drums, if brakes become too hot:
the brakes may stop working.
your ABS will malfunction.
the brakes will supply too much power to the drive wheels.
7. An alcohol evaporator:
protects the air brake system from too much pressure.
used to reduce the chance of the front wheels skidding.
is used to reduce the risk of ice in air brake valves and other parts during cold weather.
8. How do you test hydraulic brakes for leaks?
Pump the brake pedal ten times and see if it holds.
Pull forward against parking brake to make sure the hydraulic brakes holds.
Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.
9. ABS malfunction lamps are located:
under the hood.
on the driver'door.
on the instrument panel.
10. An ABS system:
gives you more control over the vehicle during braking.
helps you avoid skids caused by over braking.
All of the above.
Page 1 of 3
Next page  
Rate This Free Test
4.7 out of 5
based on 139 votes

VT Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
Number of questions: 25
Correct answers to pass:20
Passing score:80%
Share This Online CDL Test