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 New Mexico CDL knowledge test. The NM 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 New Mexico CDL Manual. Take this NM CDL practice test now to prepare for the actual air brakes test!
1. When you release the brake pedal, the _____ rotates back and a spring pulls the brake shoes away from the drum.
air compressor belt
pressure gauge
2. Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary systems should be at least:
100 psi.
75 psi.
130 psi.
3. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
slow down and test your brakes.
pull off the road and stop immediately.
activate your hazard lights and drive to the nearest place where you can stop.
4. The tractor protection valve:
provides the air supply for the brake system.
will close automatically if the air pressure drops to a certain level.
All of the above.
5. What is a dual air brake system?
2 separate air brake systems: one system operates the left brakes, the other system operates the right brakes.
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.
6. If you get stuck on railroad tracks, you should:
have a helper push your vehicle.
stay in the vehicle and call for help.
get out of the vehicle and away from the tracks.
7. If an aggressive driver is involved in an accident down the road, you should:
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
confront the aggressive driver.
try to get their vehicle to the side of the road.
8. After starting the engine, oil pressure should rise to a normal level:
within 6 minutes.
within seconds.
within 2 minutes.
9. When coupling, you should:
make sure the trailer kingpin is bent.
make sure the trailer wheels are not chocked.
be aware that wrong coupling and uncoupling can be very dangerous.
10. You hear a loud "bang" which sounds like a tire blowout. You should:
keep driving as normal.
assume you have a tire failure.
check the tires at the next stop.
Page 1 of 3
Next page

NM 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
4.6 out of 5
based on 233 votes