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 Minnesota CDL knowledge test. The MN 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 Minnesota CDL Manual. Take this MN CDL practice test now to prepare for the actual air brakes test!
1. The ________ brake system applies and releases the brakes when the driver uses the brake pedal during normal driving.
2. You are going down a steep grade. Once the vehicle is in the proper low gear, you should brake just hard enough to feel a slowdown, and then release the brakes when your speed has been reduced to ____ below your safe speed.
15 mph
20 mph
10 mph
5 mph
3. If you are being tailgated, you should:
drive on the shoulder.
speed up.
turn on your taillights.
try to let the other vehicle pass.
4. The air brake lag distance at 55 mph on dry pavement adds about:
32 feet.
75 feet.
60 feet.
16 feet.
5. The posted speed limit:
may only be exceeded when driving in rural areas.
should only be exceeded when passing other vehicles.
is only a suggestion.
should never be exceeded.
6. 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.
100 psi
50 psi
75 psi
10 psi
7. When backing a trailer, you should:
turn the steering wheel in the direction you want to go.
never make pull-ups to reposition your vehicle.
try to position your vehicle so you can back in a straight line.
avoid correcting the drift.
8. You can be sure that your vehicle is equipped with ABS:
if the vehicle was manufactured after 2000.
if the vehicle was manufactured after 1998.
if your company requires the use of antilock brakes in its policies.
if the vehicle was manufactured after 2010.
9. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
less; less
greater; more
less; more
greater; less
10. What is a dual air brake system?
2 separate air brake systems: one system operates the front brakes, the other system operates the rear brakes.
2 separate air brake systems: one system for daytime driving, the other system for nighttime driving.
2 separate air brake systems: one system operates the left brakes, the other system operates the right brakes.
None of the above.
Page 1 of 3
Next page

MN CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
Share This Online CDL Test
Rate this CDL Air Brakes Test
4.9 out of 5
based on 356 votes