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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. How can you tell if your vehicle is equipped with ABS (anti-lock braking system)?
There is no way to tell, ABS is still optional on all vehicle types.
ABS is required on all vehicles manufactured on or after 2000.
Trucks, buses, trailers, and converter dollies built after 1998 are required to have ABS.
ABS is required on all vehicles manufactured on or after 2005.
2. The safety valve is usually set to open at:
75 psi.
150 psi.
200 psi.
100 psi.
3. An alcohol evaporator is important during:
dry weather.
hot weather.
windy weather.
cold weather.
4. You should check air pressure and temperature gauges:
at the end of each trip.
every time you stop.
as often as is practical.
at the beginning of each trip.
5. A passive railroad crossing is one that:
has at least two traffic control devices installed at the crossing to regulate traffic.
does not have any type of traffic control device.
has a traffic control device installed at the crossing to regulate traffic.
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
6. After a tire has been changed, the driver should stop a short while later to:
decrease tire pressure.
check tread separation.
deflate the tire to 10 psi.
check the tightness of the nuts.
7. The air storage tanks:
stop the compressor from pumping air.
protects the tank and the rest of the system from too much pressure.
are used to hold compressed air.
are connected to the engine through gears or a v-belt.
8. When the wheels of a trailer lock up:
ABS will increase stopping power.
the trailer will tend to swing around.
the vehicle will gradually come to a complete stop.
All of the above.
9. When you make a quick lane change, the crack-the-whip effect can:
turn the trailer over.
improve your traction.
make it harder to turn without skidding.
the trailer to swing wide to the left.
10. Which of the following is NOT correct? An ABS system:
is a safety anti-skid braking system.
helps you avoid wheel lock up.
helps you stop faster.
reduces the braking pressure to a safe level.
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MN CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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